DC- HVDC converter

[nitsan]

Hi

I have been using a DC HVDC converter for a project. I am a little confused with the full load and no load characteristics for this kind of converter.The user manual states that at full load "X" Volts of input gives "Y1" volts output and for no load that same input voltage gives "Y2" volts output with Y2>Y1 by a couple of %. Why does this happen?

thanks

[vk6kro]

Do you mean: "why is the output lower on load than on no-load"? This is just a measure of how good the regulation of the power supply is.

The output voltage of almost all power supplies drops with load because the extra current causes voltage drops inside the power supply.
Regulated power supplies correct for this by monitoring the output and reducing the resistance of a series regulator in the power supply to increase the output voltage when an increased load would otherwise cause the voltage to drop.

Even these power supplies can have some voltage drop with increasing current.

In unregulated power supplies, the drop in voltage is partly due to the capacitor being partly discharged between charging pulses from the rectifier.