single phase full wave controlled rectifier usin tca 785 ppt

1. Power Electronics

2.  Basit Ali
 UW-11-EE-BSc-68
 Mobashar Manzoor
 UW-11-EE-BSc-92
 Zahid Nawaz
 UW-10-R-EE-BSc-76

3.  This design is used for firing angle control of single phase for varying firing angle this
method is of varying pulse width .
 This technique is used to control amount of voltage , current and power to be fed to
load. Phase-fired controller can synchronise itself with the modulation present at
the input
 Buck and Boost converter work on this principle.

4.  IC (TCA 785)
 SCR
 Pulse Transformer
 Fast Switching diodes
 Transistors
 Potentiometer
 Capacitor
 Resistor

5. Pin
Symbol
Function
1
GND
Q2
QU
Q2
VSYNC
I
QZ
V REF
R9
C10
V11
C12
L
Q1
Q2
VS
Ground
Output 2 inverted
Output U
Output 1 inverted
Synchronous voltage
Inhibit
Output Z
Stabilized voltage
Ramp resistance
Ramp capacitance
Control voltage
Pulse extension
Long pulse
Output 1
Output 2
Supply voltage
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

8. In modern, usually high power, equipment, the transformer is replaced with phase-
fired controllers connecting the load directly to the mains, resulting in a
substantially cheaper and lighter system.
For speed control of Motor
Buck and Boost regulators
Voltage and power control