1. Rectifier Concepts Basic Concepts Pure resistive load Inductive load
Load with an internal DC voltage
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2. Single-phase bridge rectifiers
Idealised circuit with

3. When the source voltage is zero and increasing, we call it t = 0.
Just prior to that instant, diode D3 is conducting and the voltage at the top of the diode is approximately zero volts.
Let i(t) be the inductor current; load current Id.
When D3 is conducting.
Note that i(0) is zero and when D2 turns off the inductor current is Id.

4. Single-phase bridge rectifiers
Idealised circuit with
Effect of on current commutation

5. Single-phase bridge rectifiers
This equation gives the final time.

6. Three-phase, full-bridge rectifiers
Idealised circuit with

7. Three-phase, full-bridge rectifiers
Effect of on current commutation
Tutorial problems – 5-1, 5-3, 5-4, 5-11, 5-23, 5-25.

13. Maple Script is: restart; currentdir("C:\\wattle\\courses\\PowerElectronics\\maple\\");
read "scrPracticalPage133.ma";
scrfw1phase-2.cir has the pSpice script to simulate it.

14. Tutorial Problems
6-1
6-3
6-5 (b) DPF = 0.707, PF = 0.636, THD = 48.55%. (c) DPF = 0.5, PF = 0.45, THD = 48.43%.
6-9
6-12
6-18