Negative 48 VDC Supply Input Circuit
Negative 48 VDC Supply Input Circuit
(OP)
I am tasked with designing a DC input circuit which receives as its power source, negative 48 VDC. IE, the power source has its positive terminal referenced to Earth GND and the negative terminal is HOT.
Are there any reference docs or advice on where to start?
thanks for any and all advice...
Are there any reference docs or advice on where to start?
thanks for any and all advice...





RE: Negative 48 VDC Supply Input Circuit
RE: Negative 48 VDC Supply Input Circuit
Glenn
RE: Negative 48 VDC Supply Input Circuit
a Lorain power source, in an outdoor basestation environment will provide power to a controller I'm tasked to design. The controller itself is very straight forward and I can get everything I need to do with less than 300mA at +5VDC. Where I need help is how to convert the -48VDC to any VDC thats (+). The input power is positive referenced to earth gnd. I will look into some DC/DC converters and appreciate that feedback. I am wondering if there is a simple diode protection circuit or any "gotcha's" out there to watch for.
thanks
RE: Negative 48 VDC Supply Input Circuit
You should be ok as long as the DC-DC converter is the only connection between the -48VDC and +5VDC circuits. If there is any other connection (digital I/O, etc) between the circuits then you need to provide some sort of conversion at those points as well. The type of conversion will depend on the type of signal.
Glenn
RE: Negative 48 VDC Supply Input Circuit
Keith Cress
kcress - http://www.flaminsystems.com
RE: Negative 48 VDC Supply Input Circuit
Benta.