Diode application ppt

Diode application Diode application • Rectifier circuit – Half-wave – Full-wave – Full-wave bridge – With capacitor • Clipper • Clamper • Zener diode and applications • Voltage multiplication Half-wave rectifier Half-wave rectifier • V i (t)>0 => D on • V i (t)<0 => D off Full-wave rectifier Full-wave rectifier • V i >0 => D1 on, D2 off • V i <0 => D1 off, D2 on Full-wave bridge rectifier Full-wave bridge rectifier • V i >0 => D2, D4 on; D1, D3 off • V i <0 => D2, D4 off; D1, D3 on Full-wave rectifier with capacitor Full-wave rectifier with capacitor • V i >0 => D1 on, D2 off • V i <0 => D1 off, D2 on Clipper Clipper • Parallel or serial • Serial: – V i >V => V i – V > 0 => D on => V o =V i -V – V i <V => V i – V < 0 => D off => V o =0 Clipper Clipper • Parallel with additional source – V i >4V => D off => V o = V i – V i <4V => D on => V o = 4V Clamper Clamper • Shift the level of DC • Must have a capacitor and a diode in the circuit Zener diode Zener diode • Forward bias: like normal diode • Reverse bias: – Work at the breakdown zone – Voltage = const (see the plot) • Application: always reverse bias – Reference voltage Zener diode simple application Zener diode simple application • I R =(V in -V z )/R; I L =V z /R L ; P z =I z *V z <P zmax • V in = const, R L varies: R Lmax > R L >R Lmin R Lmax =V z /(I R -I zmax ) R Lmin =RV z / (V i -V z ) • V in varies, R L = const: V imax > V i > V min V imax =RI Rmax +V z V imin = V z (R+R L )/R L [...]... voltage • Positive phase: D1 on, D2 off, VC1=Vm • Nagative phase: D1 off, D2 on, VC2=Vm+VC1=2Vm Multiple voltage • Positive phase: D1 on, D2 off, VC1=Vm • Negative phase: D1 off, D2 on, VC2=Vm+VC1=2Vm Diode – effect of temperature Homework • Chapter 2: 1, 5, 6, 10, 11, 15, 21, 23, 24, 27, 30, 34, 37, 42, 47, 49, 52 . Diode application Diode application • Rectifier circuit – Half-wave – Full-wave – Full-wave bridge – With capacitor • Clipper • Clamper • Zener diode and applications • Voltage. capacitor and a diode in the circuit Zener diode Zener diode • Forward bias: like normal diode • Reverse bias: – Work at the breakdown zone – Voltage = const (see the plot) • Application: always. the plot) • Application: always reverse bias – Reference voltage Zener diode simple application Zener diode simple application • I R =(V in -V z )/R; I L =V z /R L ; P z =I z *V z <P zmax • V in