Hi, I read on Wikipedia "A charge pump is a kind of DC-to-DC converter that uses capacitors for energetic charge storage to raise or lower voltage. Charge-pump circuits are capable of high efficiencies, sometimes as high as 90–95%, while being electrically simple circuits."

Is this power efficiency ? I mean if the input power is for example 10 Watt, the output power can be 9.0 Watt to 9.5 Watt, right ?

I assume the input power is input voltage times the input current and the output power is output voltage times the output current.

 

Hi engr,
Most converters are basically Power specified, as you know it is not possible to amplify the Power level.
So it is a Power percentage rating less than 100%
E

 

Exactly. This I wanted to clarify. We can not amplify the power with inductor less charge pump converters. That was the main question.

 

Exactly. This I wanted to clarify. We can not amplify the power with inductor less charge pump converters. That was the main question.

You can't amplify the power with an inductor either. In fact, there is no method of DC-DC conversion capable of extracting more power than you put in.

 

A charge pump inverter can, in theory, be quite efficient because the resistive losses are only in the switches and in the capacitor ESR. The trade-off is that usually they have less good output regulation.