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SMPS AC/DC REFERENCE
DESIGN USER’S GUIDE
© 2008 Microchip Technology Inc. DS70320B-page 25
Chapter 2. Hardware Design
This chapter provides a functional overview of the SMPS AC/DC Reference Design
and identifies the major hardware components. Topics covered include:
• PFC Boost Converter
• Full-Bridge ZVT Converter
• Single-Phase Synchronous Buck Converter
• Three-Phase Synchronous Buck Converter
• Auxiliary Power Supply
2.1 PFC BOOST CONVERTER
The conventional single-phase power factor correction circuit is a standard Boost
converter topology operating from the full wave rectified mains input, as shown in
Figure 2-1.
The converter controller has an inner current control loop and outer voltage control
loop. The current reference waveform is the input rectified mains voltage, so that the
resultant current drawn from the mains is essentially sinusoidal and in-phase with the
mains voltage. The amplitude of the current is controlled by the duty cycle of the fixed
frequency PWM of the MOSFET, and is controlled by the PWM reference, which is the
product of the current reference and the output of the DC link voltage error amplifier.
Refer to Chapter 1. “Introduction” for details on the operation of this converter.
FIGURE 2-1: PFC POWER CONVERTER
EQUATION 2-1:
EQUATION 2-2:
VDC
VAC
()
(
)
1
ac
dc
Vt
Dt
V
=−
22
1
1
100
ac
I
I
THD
I
−
=
%%
%
- SMPS AC/DC Reference Design 1
- User’s Guide 1
- Table of Contents 3
- Appendix B. Test Results 4
- DOCUMENTATION CONVENTIONS 7
- WARRANTY REGISTRATION 8
- RECOMMENDED READING 8
- THE MICROCHIP WEB SITE 8
- CUSTOMER SUPPORT 9
- DOCUMENT REVISION HISTORY 9
- SMPS AC/DC REFERENCE 11
- DESIGN USER’S GUIDE 11
- Chapter 1. Introduction 11
- 1.2 BLOCK DIAGRAM 12
- Introduction 13
- HV Bias Supply 24
- CONVERTERS 28
- Chapter 2. Hardware Design 29
- 2.1.1 Power-Train Design 30
- Hardware Design 31
- 2.2 FULL-BRIDGE ZVT CONVERTER 34
- 41.592.74 38
- Chapter 3. Software Design 55
- Software Design 57
- 3.5.1 Output Sequencing 68
- Table 3- 7 70
- Chapter 4. System Operation 71
- System Operation 73
- 4.1.4 System Connections 74
- 4.2 SYSTEM OPERATION 76
- Board Layouts and Schematics 81
- Test Results 101
- AC and 220 VAC 106
- AC WITH 106
- B.8 TEST RESULTS TABLE 108
- Appendix C. References 113
- Worldwide Sales and Service 118
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