Diode Rectifiers
Diode Rectifiers
Diode Rectifiers
EE 442-642
5-1
Current begins to flow when the input voltage exceeds the dc back-emf.
Current continues to flows for a while even after the input voltage has gone
below the dc back-emf.
5-3
Filters
Filters are employed in rectifier circuits for smoothing out the dc output
voltage of the load.
5-6
Inductor DC Filter
5-7
5-8
Is Id
I sh I s1 / h, h 3,5,7,...
Current THD
DPF 1
PF 0.9
Power Factor
5-9
5-10
Ripple Factor:
2Ls I d
2Vs
Commutation angle:
cos 1
Vd 0.9Vs
2Ls I d
5-12
5-13
5-14
5-16
Vdo
3Vm 1.654Vm
Vrms Vm
3 9 3
1.655Vm
2 4
5-17
5-18
5-19
I s 2 / 3I d 0.816 I d
I sh I s1 / h, h 3,5,7,...
Current THD
DPF 1
3
PF 0.955
5-20
Commutation angle:
cos 1
2Ls I d
2VLL
Vd 1.35VLL
3Ls I d
5-21
5-22
PSpice-based analysis
5-23