can I discuss it on the forum? The picture would show a circuit that is not safe at all, thin flying wires, and 1uF capacitor which can charge upto 700 volts, always have to short it manually.
sure a series inductor, what would be the required value in mH? And they need to be large as some electric power is lost inside them.I don't see why you are going through the voltage multiplier system and what not. Back years ago it was normal to run four pin florescent tubes under 48" long directly off of 120 VAC power with nothing more than a series inductor and a lamp starter module.
Simple, highly reliable, and cheap.
The size and value will depend on how much current your lamp needs. Most 48" tubes need around 450 - 500 ma to run at full brightness.what would be the required value in mH? And they need to be large as some electric power is lost inside them.
yes I looked at a lot of schematic, but dont have suitable cores or magnet wire here. Also these pocket lammps dont drive the tubes at full power i have read.Thought you were the joule thief king. I'm shocked you're not using a blocking oscillator/transformer to get the HV you need. That's how it's done in the floro lamps I've taken apart. The transformer is small much less than 1 in^3. The circuit amounts to a version of the JT, but it used push-pull transistors aka Royer circuit.
yes some years ago I had larger fluoro fixtures with a ballast inside. The right one for the thin 6W tube might be hard to find. Eventually I will try it with a PCB from a CFL some day.The size and value will depend on how much current your lamp needs. Most 48" tubes need around 450 - 500 ma to run at full brightness.
Inductor size wise the one we have over in dads shop has a inductor ballast that is about the size of a 30 - 40 va transformer and most any decently stocked hardware or building supply store still caries them. They cost about $10 - $15 for a new ballast inductor and starter unit.
BTW other than during power outages that light over at dads has been on continuously for about 20 years now.
The Royer isn't only used on pocket lamps. I've found it on everything from CFL lamps to copy machine CCFL backlights.Also these pocket lammps dont drive the tubes at full power i have read.
you compare the pocket lamps which indeed step up voltage, to CFLs. These just rectify and then generate high frequency, which is sent through a ballast. The transformer on the ringcore is just for oscillation, the larger core only has a single winding. It is effectively a ballast.The Royer isn't only used on pocket lamps. I've found it on everything from CFL lamps to copy machine CCFL backlights.
As a kid I had a old desk lamp that used a small 1/2" x 6" fluorescent lamp in it and that had a small inductor ballast in the base on it so I know they exist some place.yes some years ago I had larger fluoro fixtures with a ballast inside. The right one for the thin 6W tube might be hard to find.
I didn't compare anything to anything. I said the CFL uses a Royer converter, at least every single one I've looked at does. It runs at full power and full brightness. Whether or not is uses a step-up transformer is immaterial. However, the converter can be used to step up voltage if designed correctly.you compare the pocket lamps which indeed step up voltage, to CFLs. These just rectify and then generate high frequency, which is sent through a ballast. The transformer on the ringcore is just for oscillation, the larger core only has a single winding. It is effectively a ballast.
there are some differences for instance the primary isnt center tapped. Also the transformer is only used for feedback.I didn't compare anything to anything. I said the CFL uses a Royer converter, at least every single one I've looked at does. It runs at full power and full brightness. Whether or not is uses a step-up transformer is immaterial. However, the converter can be used to step up voltage if designed correctly.
Royer oscillator circuit
The circuit consists of a saturable-core transformer with a center-tapped primary winding, a feedback winding and (optionally) a secondary winding. The two halves of the primary are driven by two transistors in push-pull configuration. The feedback winding couples a small amount of the transformer flux back in to the transistor bases to provide positive feedback, generating oscillation. The oscillation frequency is determined by the maximum magnetic flux density, the power supply voltage, and the inductance of the primary winding.
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