Why are charge pumps only available in low output currents?

[Speakerguy]

Why are inductorless, capacitor-based charge pumps only available in 100ma or less from places like TI, Linear, etc? Is there some limiting factor that makes anything more than this have to use an inductive solution? I am wanting a voltage inverter that will operate at a few hundred ma and having trouble finding one (edit: a capacitive one I mean).

 

[MikeMl]

Efficiency, and the peak current flows while the pump switch is closed. The peak current is leveled if there is an inductor.

 

[Speakerguy]

Gotcha. Makes total sense, switch current would be much more controlled in an inductive switcher. Thanks!

 

[audioguru]

Charge pump ICs like the ICL7660 use Cmos transistors that have a low current at low voltages.

 

[Boncuk]

Hi speakerguy,

if you need higher currents refer to DC/DC-converters. They are available as 1W (4pin SIL), 1W DIL-8, 2W (7pin SIL) and 3W DIL-24.

Boncuk

 

[bryan1]

In danger of going off the thread topic,

What about using a transformer, say wind a transformer with 15 turns of 7x3mm copper enameled wire with say 150 turns of 3mm round enameled wire for a higher voltage output then winding the same for the return. Talking about 75-100 amps here. Does a transformer work with an UP voltage then the same voltage using the same transformers wound with the same down voltage at the other end, of course with a heap of loses? This is an idea for the long run I have for my best wind site so if this is total bollocks hey shoot me down.

Cheers Bryan

 

[UnloadedQ]

In danger of going off the thread topic,

What about using a transformer, say wind a transformer with 15 turns of 7x3mm copper enameled wire with say 150 turns of 3mm round enameled wire for a higher voltage output then winding the same for the return. Talking about 75-100 amps here. Does a transformer work with an UP voltage then the same voltage using the same transformers wound with the same down voltage at the other end, of course with a heap of loses? This is an idea for the long run I have for my best wind site so if this is total bollocks hey shoot me down.

Cheers Bryan

Dangerous thing, working with 240V @ 100A However, that's the basic idea. Check out **broken link removed** for an example at 24KW. Cheers, mate!