Advantages of Three-Phase Rectifiers over Single-Phase Rectifiers

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Presentation transcript:

Advantages of Three-Phase Rectifiers over Single-Phase Rectifiers Higher output voltage for given input voltage. Lower amplitude ripples i.e., output voltage is smoother Higher frequency ripples, simplifying filtering (lower size of filter circuit parameters because of higher ripple frequency) Higher overall efficiency 2

Three-Phase Half-Wave Rectifiers Three-Pulse Rectifiers 3

Load voltage waveforms Circuit Diagram Load voltage waveforms 4

Current Waveforms 5

VD1 VD2 VD3 VAC VBC VCA VCB Period On diode Off diodes 030 ° D3 D1 & D2 VAC VBC 30 º150º D1 D2 & D3 VCA 150º 270º D2 D3 & D1 VCB 270º390º 6

Voltage across diodes VD1 7

VD2

VD3

With Inductive Load 10

THREE-PHASE FULL-WAVE BRIDGE RECTIFIERS Six-Pulse Rectifiers

Equivalent circuits of six-pulse rectifier

Diode and Line current waveforms

With Inductive (RL) Load

TWELVE-PULSE RECTIFIERS

Circuit Diagram