1. Unit – 6 voltage regulators

2. VOLTAGE MULTIPLIERS
Voltage multipliers are used to step up the output voltage level to two or more times the peak voltage of input.
The various voltage multiplier circuits are:
Voltage Doubler
Voltage Tripler
Voltage Quadrapler

3. Voltage Doublers
A voltage doubler provides an output that is twice its peak input voltage.
Half wave Voltage Doubler
Full wave voltage Doubler

4. Half wave Voltage Doubler

5. Operation During Positive Half cycle of input: D1 forward biased
D2 reverse biased
Capacitor C1 will charged to Vm

6. Operation During negative half cycle of input: D1 reverse biased
D2 forward biased
Capacitor C2 gets charged.
Voltage across C1 remain as Vm.

7. Contd…..

8. FULL WAVE VOLTAGE DOUBLER

9. CONTD…….. During positive half cycle: D1 forward biased.
Capacitor C1 charges to Vm

10. Contd…. During negative half cycle: D2 forward biased.
Capacitor C2 charges to Vm

11. Contd…..

12. Voltage Tripler

13. Operation During first positive cycle: D1 forward biased.
D2, D3 reverse biased.
C1 charges to Vm

14. Contd….. During next negative half cycle: D2 forward biased.
C1 will holds entire charge and voltage remains as Vm.
C2 charges to 2Vm

15. Contd…

16. Contd….. In next positive half cycle: C2 retains voltage 2Vm
D3 is forward biased.
D1, D2 reverse biased.
C3 charges to 2Vm.

17. Contd….

18. Voltage Quadrupler