I need a physically small and moderately priced high voltage generator. High voltage is a relative term...so….
VIN = 5Vdc, up to 500 mA, the 5V supply is external (not located inside the specified enclosure)
VOUT = AC or pulsating DC, 1500V peak to peak, more is better, but not necessary
Physical size (MAX) 7cM Length, 4cM Wide and .6cM height
My load will range from 10uA up to 2mA
Regulation is not needed (or desirable)
The output is only needed for 5 to 15 seconds at a time with a rest time of at least 3 hours between uses so the need for heatsinks is not a significant issue
It seems a step up transformer is needed, but where to get a smaller transformer that allows electronics and the transformer to fit within the enclosures limited volume? The obvious answer to me is to use an SMPS with a 50/50 on/off driver.
Step up transformers/LCD inverter/backlight chip seems like a viable answer, but the transformer needed at 20 to 40 kHz switching frequency gets to be very large. I’m thinking I need to use an HF frequency transformer (in the 2 to 5 MHz range), which significantly reduces the physical size of the step up transformer. There are no LCD inverters/backlight chips that function in the MHz range however.
I have reverse engineered some electronic arc lighters that are popular these days, but the transformer for 20 to 30 kHz operating frequency are much to large for my enclosure.
I have thought of using an rf generator with a transformer (sinewave/non-smps), but I’m having trouble finding the needed ferrite to work between 2 and 5 MHz. Common toroids for that frequency range are almost impossible to wind, so an E core (or similar) ferrite core with a bobbin is probably needed.
The use of a Planar transformer a possibility, but no one makes a commercial unit that is small enough for my use. The smallest planar transformer I could locate is a 3 watt core (Coilcraft), which is much to large for my enclosure.
I cannot use energy storage capacitors or a cockcroft-walton voltage multiplier because they will only produce DC.
Any suggestions?
VIN = 5Vdc, up to 500 mA, the 5V supply is external (not located inside the specified enclosure)
VOUT = AC or pulsating DC, 1500V peak to peak, more is better, but not necessary
Physical size (MAX) 7cM Length, 4cM Wide and .6cM height
My load will range from 10uA up to 2mA
Regulation is not needed (or desirable)
The output is only needed for 5 to 15 seconds at a time with a rest time of at least 3 hours between uses so the need for heatsinks is not a significant issue
It seems a step up transformer is needed, but where to get a smaller transformer that allows electronics and the transformer to fit within the enclosures limited volume? The obvious answer to me is to use an SMPS with a 50/50 on/off driver.
Step up transformers/LCD inverter/backlight chip seems like a viable answer, but the transformer needed at 20 to 40 kHz switching frequency gets to be very large. I’m thinking I need to use an HF frequency transformer (in the 2 to 5 MHz range), which significantly reduces the physical size of the step up transformer. There are no LCD inverters/backlight chips that function in the MHz range however.
I have reverse engineered some electronic arc lighters that are popular these days, but the transformer for 20 to 30 kHz operating frequency are much to large for my enclosure.
I have thought of using an rf generator with a transformer (sinewave/non-smps), but I’m having trouble finding the needed ferrite to work between 2 and 5 MHz. Common toroids for that frequency range are almost impossible to wind, so an E core (or similar) ferrite core with a bobbin is probably needed.
The use of a Planar transformer a possibility, but no one makes a commercial unit that is small enough for my use. The smallest planar transformer I could locate is a 3 watt core (Coilcraft), which is much to large for my enclosure.
I cannot use energy storage capacitors or a cockcroft-walton voltage multiplier because they will only produce DC.
Any suggestions?