Direct Current Power Systems 191
DC FILTERING METHODS
The pulsating direct current produced by both single-phase and three-
phase rectifier circuits is not pure DC. A certain amount of AC ripple is evi-
dent in each type of rectifier. For many applications, a smooth DC output
voltage, with the AC ripple removed, is required. Circuits used to remove
AC variations of rectified DC are called filter circuits.Figure 7-25. Three-phase full-wave rectification: (A) Schematic diagram, (B)
Input/output voltage waveforms