Looking for simple and reliable voltage doubler 12->24v

Then you need to use a transformer - preferably with push pull drive.

As your air solenoids presumably wouldn't require a regualted 24V, you may find this off-the-shelf unit meets your requirements (unless you have compelling reasons to build your own).

--- Like you know something about it? "Charge pump" _requires_ a DC output, so post a schematic instead of just flapping your jaws, bonehead.

Come to think of it, I don't think I've ever seen you post anything other than your self-serving run-of-the-mill drivel.

Geez, I wonder why???

Could it be because you're still the same (idiot electrician licensed in Canada because you managed to bullshit your way through the test) simple s*it who couldn't figure out how to use a current transformer?

More than likely.

-- JF

I have some 24v hydraulic valves that work just fine at 12v -- so just for grins -- try tripping the solenoid on 12v -- its just an electromagnet and may pull suffciently to operate on the lower voltage

huh? a charge pump needs push-pull but no transformer. and a boost converter needs only a single ended drive on the inductor

for 12 W?

sure.

Bye. Jasen

You can use a diode to replace the the other transistor. You actually don't need a transformer, just a coil. The coil is between the battery voltage and the load with the diode in series after the coil. The transistor pulls the coil-diode connection to ground long enough to put enough current into the coil, then it releases. While the transistor is turned on, the diode is reverse biased. When the transistor opens up the coil field collapses and the voltage on it reverses boosting the output voltage. With this wiring the coil voltage adds to the battery voltage. A controller modulates the pulse width of the transistor drive in order to maintain a set output voltage.

These circuits are not hard to understand, but they are closed loop feedback controllers and attention must be paid to all the details. So it would be easier to use one off the shelf or to change the solenoids to work on a 12 volt drive.

The solenoid valves I have seen have 2 parts: the valve body and the coil. You select the coil according to the voltage source you have available. Is getting a coil of the proper voltage not an option?