Are there switched dc dc converters which could rise 1v to 1kV or viceversa and having small losses. The transferred power is small (at the output) of the order of 25mW.
Please help if you have some information.
Thanks.
For this purpose you must use several stage in series include a boost or SEPIC converter with Multiplier (capacitor and diode ) and maybe some resonant circuits.
like this one :
Thanks, for the answer. What about the energy efficiency do you know if for a amplification factor of 1000, 90% is possible? Any publications on such converter?
I agree than boost + voltage multplier chain is the easyest configuration.
If the boost voltage is much higher than the diodes forward voltage drop, and the capacitors are big enough to have very small voltage drop, I think that 90% efficiency is possible.
I would use a load resonant converter e.g. an LLC-type. The winding ratio of its transormer can be easily adjusted to any input and output voltage. When using input or output voltages of up to 1 kV, as you have mentioned, the transformer also offers a safety feature. More challanging is the target efficiency of 90 % at a power level of just 25 mW.
I would use a load resonant converter e.g. an LLC-type. The winding ratio of its transormer can be easily adjusted to any input and output voltage. When using input or output voltages of up to 1 kV, as you have mentioned, the transformer also offers a safety feature. More challanging is the target efficiency of 90 % at a power level of just 25 mW.
Yes, using a transformer, reaching 90% efficiency at 25 mW is really difficult. I suppose you have to be very conservative with the frequency. If the turns ratio is too high, it would be very difficult to achieve the goal, and probably it is better to use a moderate turns ratio + voltage multiplier. The transformer design or the LLC converter is quite critical. Perhaps a simpler solution is a dual forward. You may add a small inductor in series with the primary (with 2 damping diodes added) to make the turn on smoother, and all energy in this inductor and the leakage inductances will be returned to the DC bus.
An even simpler and still high efficiency, for high voltage output, will be the dual boost, also the leakage energy is returned to the DC bus and there is no need of output inductor.
You may try using switched capacitor networks. Capacitors with very low ESR and diodes with very low ON-state voltage drops might help in achieving the desired efficiency of >90%. But its a real challenge practically.
Are there some inductif components in the switched capacitor network you are talking about?
Switched capacitor (SC) networks are formed by diodes and capacitors only. Inductors will not be present in the SC networks. However, one energy transfer inductor (as in case of a boost converter) is a must.
you can used multilevel converter (three level) with capacitor and you need current supply
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