I want to build a(quick simple design=least amount of parts)compact/portable inverter use a 9v battery making 22volts?

I always wanted to make a type of SILENT portable hand held lighter/ignition source that doesn't use flints or fuel that can ignite any firecracker fuses, cigarettes, or generate enough heat in a quick time. So what i did was part out my moms old 1875watt hair dryer that she burnt out the motor to and i kept the spring coils portion that used to make the air blown hotter. I cut a 1inch piece of them heat coils, mounted it to an old parted out lighter reservoir and wired the piece up with a momentary slider type switch on the side of the reservoir that is being my safe to the touch so i can hold portion -  to a cigarette car lighter type plug adapter and plugged it to my car battery jumper pack that has the cigarette lighter receptacle.(i did this as it was my only option to a DC type of power because at the time i didn't have batteries & unsure how much it would need) now i tested it by sliding the slider switch on and in less than 7seconds it had lit up bright orange and really hot. Okay cool its almost exactly what i wanted but i don't want to have to plug it in to anything or carry around a huge heavy battery pack. So i tried to connect a 9 volt battery to it since that would in fact make it compact & portable completing my design,  but when i push the slider switch to on it took really long to generate any heat(barely even lit up)and killed the battery after holding it on to get any type of heat for like 4-5minutes.

I need it to lit up to its bright orange HOT in that 7seconds or less and i need or would like it to have longevity or more then 1 time use.


seandogue6 years ago
Two things. First, to step-up the voltage, you need a voltage multiplier. Several discrete designs can be built, but there are also many ICs that will do the job for you, and in so doing, remove the element of having to design and fabricate the step-up converter. Check digikey under DC/DC converters. Look for "step-up" converters.

Second, The reason you need so much amperage is that you're using a relatively heavy igniter wire. Reduce it's size (diameter) to reduce the effective current requirement to produce a red hot ignition source. Nichrome wire can be purchased quite easily from suppliers like digikey or at electronics surplus stores.

We routinely used 30ga nichrome wire at NASA's microgravity facilities for ignition of combustion directorate experiments, although for a re-use application I'd be inclined to double that diameter.

Best fed using a constant current source, rather than a voltage source, because you can experiment with the source current to make the delivery ideal for reuse and heat up time, so it might be most effective to follow the voltage source with a constant current regulator.

Alternatively, you might consider a high frequency arc igniter.
frollard6 years ago
Another thought: I hate 9 volts for a reason, they suck. They hardly provide any amperage, and have very little total capacity (lots of wasted space in there). Another option is running a shorter piece of heat wire - less length = less resistance = more current = hotter. If 1 inch works with 12v @ whatever amps, then less voltage would work at proportionally less...the other thing is that you can use is ohms law to figure out the current draw, and get a suitably sized battery pack from that. I would recommend 4x AA over 1x 9V any day.
NachoMahma6 years ago
. Going by your description, 9V may be enough. Try connecting two to four 9V batteries in parallel and see if that has enough ampacity to do the job.
orksecurity6 years ago
Websearch "DC to DC converter". Battery feeds oscillator, oscillator output is put through transformer to boost voltage, then (if desired) rectify and regulate back to smooth DC. Caveat: You can't increase power. What you gain in voltage you more than lose in amperage you can draw. You would probably be better off switching to a heating wire suited to your battery, such as the igniters used for model rocket engines.