This document discusses a three phase full bridge rectifier. It contains the following key points: 1) A three phase full bridge rectifier uses six diodes arranged in two groups - a top positive group and a bottom negative group - to rectify an alternating current into direct current. 2) Each diode conducts for 120 degrees in pairs, with one diode from the top group and one from the bottom group conducting at any given time. 3) The rectifier can operate with or without source inductance, and a finite inductance causes distortion in the line current waveform. 4) Research is being conducted into developing higher frequency rectifiers that can rectify terahertz and light frequencies for applications

1. THREE PHASE FULL BRIDGE RECTIFIER
NAME : MD SHEIKH SADI
ID : 2015006623
MAJOR : MECHATRONICS ENGINEERING
HUZHOU UNIVERSITY

2. Power Electronics Devices
Power Electronics is an art of converting electrical
energy from one form to another in an efficient,
clean, compact & robust manner.

3. Types of Power Electronics Converters
Diode rectifiers (uncontrolled rectifiers)
Ac to dc converters ( controlled rectifiers)
Dc to ac converters (Inverters)
Dc to dc converters (choppers)
Ac to ac converters (cycloconverters)
Static switches

4. Three Phase Full Bridge Rectifier
There are six diodes are used in three phase full bridge
rectifier.
There are two groups:
1)-Top group or Positive group (Diode 1,3 & 5)
2)-Bottom group or Negative group (Diode 2,4 & 6)
Positive group diodes will conduct for positive half cycle.
Negative group diodes will conduct for negative half cycle.
Each diode will conduct for 120 degree in each pair.

5. Three Phase Full Bridge Rectifier
We study two cases in three phase full bridge rectifier:
Case 1:- When ac side inductance is zero (𝐿𝑠 =0)
The current 𝐼𝑑flow through one diode from the top group
& one diode from bottom group.
In top group one of the diode with its anode at the highest
potential will conduct & the other two became the reverse
biased.
In bottom group one of the diode with its anode at the
lowest potential will conduct & the other two became the
reverse biased.

6. Three Phase Full Bridge Rectifier

8. Phase voltage & current for one phase of three phase rectifier

9. Effect of 𝐋𝒔 on current commutation

10. Current Commutation process

11. Current Commutation process

12. Distortion in line -current waveform
Three phase rectifier with a finite 𝑳𝒔 and a
constant dc voltage
Equivalent CKT

13. Distortion in line -current waveform

14. Comparison B/w Single phase & Three phase Rectifiers

15. Recent Research
A major area of research is to develop higher frequency
rectifiers, that can rectify to terahertz and light frequencies.
These devices are used in optical heterodyne detection,
which has myriad applications in optical fiber communication
and atomic clocks.
Another prospective application for such devices is to directly
rectify light waves picked up by tiny antenna, called
Nantennas, to produce dc electric power.

16. Thank
you
everyone