Texas Instruments UCD3138 Digital Power Factor Correction Pre-regulator Evaluation Module UCD3138PFCEVM-026 UCD3138PFCEVM-026 Datenbogen
Produktcode
UCD3138PFCEVM-026
Vs
RL
Vbus
Q1
D1
Cb
Signal
Conditioning
Rs1
EMI Filter
& Inrush
Relay
Gate
Driver
L1
Iin
D2
Signal
Conditioning
Signal
Conditioning
Vin
Iq1
DPWM 1B
Vin_L
Vbus_sen
I_shunt
Vin_N
Vbus_ov
Single-phase PFC
Circuit Diagram
Circuit Diagram
Signal
Conditioning
I_CT1
Digital PFC Description
12
Digital PFC Description
12.1 1PFC Block Diagram
12.1.1
Single-Phase PFC Block Diagram
Single-phase PFC function block diagram is shown in
. The digital controlled single-phase PFC
has the same power stage as those seen in other analog controlled devices. The main difference is the
line voltage is sensed then rectified inside the UCD3138 digital controller. All signals interact with
UCD3138 and explained in section
line voltage is sensed then rectified inside the UCD3138 digital controller. All signals interact with
UCD3138 and explained in section
Figure 25. Digitally Controlled Single-Phase PFC System Block Diagram
25
SLUU885B – March 2012 – Revised July 2012
Digitally Controlled Single-Phase PFC Pre-Regulator
Copyright © 2012, Texas Instruments Incorporated