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#### Mook Johnson

- Jan 1, 1970

- 0

Here is the circuit

VSupply ---------/\/\/\/------------ Vout @ X watts load

R

The Vsupply is a power supply whose output voltage follows this equation.

Vsupply = 500 + Iout * R

Iout is the supply output current and R is the resistance between the source

and load.

R is between 200 and 500 ohms depending on the installation.

The load is a switching power supply (costant power) that consumes 50 - 400W

and wants a nominal input voltage of 500V.

The intention is that as the power consumption goes up the input current

goes up and the supply voltage goes up at the same time to maintian the

supply input voltage at ~500V. These loads move slowly so there is plenty of

time for the source to respond to load changes.

I'd like to setup some equations to see what happens of the R value used in

the surface equation is different from the actual resistance between source

and load. How far off can they before the compensation causes an error of +

or - 100V at the supply input.

Seems like a straight forward problem but its got me twisted up somewhat.

Can any of your guys with sharp math skills help me out.

thanks