Re: Reverse Polarity and Over Voltage Protection Design
Posted: Sat Aug 16, 2008 8:13 pm
It's not just about voltage linearity and regulation though. These caps are upsized to provide some short term energy buffer during the rapid fluctuations of battery voltage during cranking on each compression stroke. For that reason the series resistor and largish electros are there. The tant and ceramics cover different frequency bands and reduce the ESR further.
Perhaps we should KISS with the power supplies and simply have something close to the original setup without the zener clamp or equivialent. IE :
reverse diode 1N5408
1R low pass resistor
normal polarised electro cap of suitable largish size and 35 - 60 volts rating
tant cap in size/spec as per the schem explanation
ceramic cap
reg
same caps again except 10v rating on the electro and tant
That provides reverse protection for cheap and compact, *very* clean power, simple design and layout, common parts, etc
This is only a first cut after all.
Thoughts?
Fred.
Perhaps we should KISS with the power supplies and simply have something close to the original setup without the zener clamp or equivialent. IE :
reverse diode 1N5408
1R low pass resistor
normal polarised electro cap of suitable largish size and 35 - 60 volts rating
tant cap in size/spec as per the schem explanation
ceramic cap
reg
same caps again except 10v rating on the electro and tant
That provides reverse protection for cheap and compact, *very* clean power, simple design and layout, common parts, etc
This is only a first cut after all.
Thoughts?
Fred.