1. Electronic
Voltage multiplier
Prepered by
Asst.lect. Mays Ibrahim

2. VOLTAGE-MULTIPLIER CIRCUITS
Voltage-multiplier circuits are employed to maintain a relatively low transformer peak voltage while stepping up the peak output voltage to two, three, four, or more times the peak rectified voltage.

3. Voltage multipliers are using in many electrical and electronic circuit applications such as in microwave ovens, strong electric field coils for cathode-ray tubes, electrostatic and high voltage test equipment, etc, where it is necessary to have a very high DC voltage generated from a relatively low AC supply.

4. Voltage multiplier circuit
Voltage doubler
Voltage tripler and quadrupler
Half wave voltage doubler
full wave voltage doubler

5. Voltage Doubler
Vm Vm

6. Half wave voltage doubler
During positive half cycle
Vm-Vc1=0
Vm =Vc1

7. Half wave voltage doubler
During negative half cycle
-Vm –Vm +Vc2=0
Vc2=2Vm

8. Full wave voltage doubler
Vm Vm

9. Full wave voltage doubler
For positive half cycle

10. Full wave voltage doubler
For positive half cycle
D1 is Forward biasing(F.B)
D2 is Reverse biasing(R.B)
+Vm-Vc1=0
Vc1=Vm

11. Full wave voltage doubler
For negative half cycle

12. Full wave voltage doubler
For negative half cycle
D1 is Reverse biasing(R.B)
D2 is Forward biasing(F.B)
-Vm+Vc2=0
Vc2=Vm

13. Full wave voltage doubler
Vo=Vm+Vm
Vo=2Vm

14. Voltage Tripler and Quadrupler
Vm Vm
Vm Vm
Vm Vm

15. Voltage Tripler and Quadrupler
Vm-Vc1=0
Vm=Vc1

16. Voltage Tripler and Quadrupler
-Vm-Vm+Vc2=0
Vc2 = 2Vm

17. Voltage Tripler and Quadrupler
+2Vm-Vc3=0
Vc3 = 2Vm

18. Voltage Tripler and Quadrupler
-2Vm+Vc4=0
Vc4 = 2Vm

19. Voltage Tripler and Quadrupler