It is a rectifier circuit which uses diodes and capacitors inorder to produce a DC output voltage, being the multiple of the peak value of AC input voltage. This process is cost effective. Example : Voltage doublers and voltage triplers.

an electrical circuit that converts dc electrical power from a low voltage to a higher

A type of rectifier circuit that is arranged so as to charge a capacitor or capacitors on one half-cycle of the ac input voltage waveform, and then to connect these capacitors in series with the rectified line or other charged capacitors on the alternated half-cycle. The voltage doubler and tripler are commonly used forms of the voltage multiplier.

a great way to create a high voltage DC power supply

an attractive high-voltage, low-current supply, as required for cathode-ray tubes and photomultipliers

a set of components designed to increase the voltage for a particular application.