Step Down Filter
Step down voltage converter?
I'm responsible in my team to design a device that steps down a high voltage (not sure how high but pretty high) to a low voltage (10V). Within that voltage we are converting is a particular signal (a voltage square wave pulse) among others that we we wish to obtain by filtering after the step down. What are some suitable methods for the step down(is it a simple transformer?)? And will the step down distort the voltage pulse to the point where if we filter it after, it cannot be obtained? (The voltage pulse is a short burst pulse using transmission line theory).
The voltage I want to use at the end is DC but there are AC voltages also coming in. We want to use this voltage to go into a programmable logic controller. Wouldn't it be expensive to filter before the step down with such high voltages?
Is the high voltage DC or AC or some sort of pulse? Is this high voltage a power that you want to use,or just a signal to modify?
It appears that the high voltage (how high?) is a signal that you just want to work with, so reduce it to a lower lever with a simple resistor divider. You will probably need a compensated divider where there are small caps across the resistors in inverse proportion to the R value to maintain the division ratio at higher frequencies, like a scope probe.
Depending on the voltage levels, the resistor may have to actually be a series string of resistors, as a typical resistor has a voltage rating of about 500 volts.
Typical compensated divider (100:1): 99 M resistor in parallel with 10pF cap, in series with a 1 M resistor in parallel with a 1000pf cap.
http://www.elexp.com/t_probe.htm
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