Price of voltage doubler DC inverter

The double-conversion eliminates all mains power disturbances. A rectifier converts the alternating current (AC) from the mains to direct current (DC ). This DC charges the batteries and powers the inverter. On the basis of this DC voltage, the inverter generates a sinusoidal AC voltage, which permanently supplies the loads.

A voltage doubler is an electronic circuit that converts an AC input voltage to a DC output voltage that is twice the peak input voltage. It is a type of voltage multiplier circuit. Voltage doublers are commonly used in electronic devices that require higher DC voltages than the AC voltage that is readily available from wall outlets or batteries.

Voltage doublers offer several advantages compared to using a step-up transformer with a rectifier for generating a high DC voltage: The main cost savings is elimination of the transformer, which is often the most expensive single component. Diodes and capacitors are relatively inexpensive.

Voltage doublers can often be used over a wider range of inputs without modification. This is because the doubling action depends on the peak AC voltage, not the RMS value. So a voltage doubler can accommodate power line voltage variations of ±10% or more without significant change in the DC output.

At high currents, the I2R losses in the ESR (equivalent series resistance) of the capacitors becomes substantial. And the diode forward voltage drop wastes an increasing percentage of the input power. As a result, voltage doublers are usually limited to lower power applications, typically under 10-20W.

Voltage doublers have no such natural current limiting (apart from the I2R losses and diode current limits mentioned above). Separate overload protection circuits must be added if deemed necessary for the application. Without a transformer to provide galvanic isolation, the output of a voltage doubler is directly connected to the AC line.