As you could see from the image below i want to understand what is the -V in a switching power supply unit and where i can use it?
Switching power supply -V
powerswitch-mode-power-supply
Related Solutions
After repairing a returned unit, take a very careful oscillogram across the Schottky with a short 10:1 scope probe (directly connect the tip and use a very short ground wire) and no bandwidth limiting on your good quality (100MHz or better, digital storage preferred) scope.
An example of a short probe, borrowed from elsewhere on EE.SE:
What you're looking for is high voltage (a spike, or ringing) on the leading edge of the voltage waveform. Any time you switch an inductive load, there's the potential for high voltage - unless you carefully look for it (i.e. with a short probe and a good scope) you won't see it. Your layout will have a great influence on whether or not there will be nastyness across the Schottky, so measure to be sure.
If you do end up seeing something ugly, you may need to introduce an RC snubber across the Schottky to keep the diode from avalanching.
Yes, those are solder jumpers. They basically allow you to jump the two connections using a solder blob. As an example, in this breakout board schematic (here is the link for the product in case someone wants to know where I referenced this schematic from) from sparkfun, you can see two solder jumpers. And this is the picture of how they look on the PCB
Best Answer
The V- is the more-negative terminal of the DC output.
Line (
L) and Neutral (N) are the AC mains inputs. The ground (⏚) symbol is for protective earth.The DC outputs are the
+Vand-V, where V- is the more negative connection.The DC outputs may be floating, relative to the protective earth input. This would allow you to connect two of these power supplies in series, and ground the midpoint, which would produce a bipolar, protective-earth referenced power supply.
As to where you would use it, you would use it any time you use the power supply. You have to use it to use the power supply. It's where you connect for one terminal of the DC output.