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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I've asked this before, but hopefully I can find some kind of answer. I have a voltage source between 100v and 300v, but I don't know the value (this is one of the assumptions for the circuit). How can I develop a known reference voltage when i don't know the input value to the circuit? I would like to be able to get 5v to run some IC chips like a comparator. Someone said a flyback might works, but I don't know how to implement that solution. Any suggestions? Are zeners the only way?
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
A zener diode is the simplest way, and the most ineficient way (expecially for a 300v to 5v conversion, you will get 1-2% efficiency)
One thing to consider is a 'universal' input smps supply (such as a cell phone charger), these are usually rated for 90-240v ac, which assuming they have an internal bridge rectifier would imply about 130-340v dc input. Many of them will run with lower voltages, but 100v would be pusing it.
It would be possible to make your own, but smps design is not for the faint of heart, and I would recomend getting a cheep pre built module,
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Depending on how much 5V load current you have, use some series resistors to drop the input voltage from 100V-300V to say 7.5V - 22.5V and use a 5V linear regulator. Of course, if you're pulling a lot of current, the series resistor and regulator may dissipate LOTS of heat.
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voltage reference with an unknown voltage source
