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UNIT – 6 VOLTAGE REGULATORS 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 Voltage Doublers • A voltage doubler provides an output that is twice its peak input voltage. • Half wave Voltage Doubler • Full wave voltage Doubler Half wave Voltage Doubler Operation • During Positive Half cycle of input: • D1 forward biased • D2 reverse biased • Capacitor C1 will charged to Vm Operation • During negative half cycle of input: • D1 reverse biased • D2 forward biased • Capacitor C2 gets charged. • Voltage across C1 remain as Vm. Contd….. FULL WAVE VOLTAGE DOUBLER CONTD…….. • During positive half cycle: • D1 forward biased. • Capacitor C1 charges to Vm Contd…. • During negative half cycle: • D2 forward biased. • Capacitor C2 charges to Vm Contd….. Voltage Tripler Operation • During first positive cycle: • D1 forward biased. • D2, D3 reverse biased. • C1 charges to Vm Contd….. • During next negative half cycle: • D2 forward biased. • C1 will holds entire charge and voltage remains as Vm. • C2 charges to 2Vm Contd… Contd….. • In next positive half cycle: • C2 retains voltage 2Vm • C1 retains voltage Vm. • D3 is forward biased. • D1, D2 reverse biased. • C3 charges to 2Vm. Contd…. Voltage Quadrupler