DC/DC converter foldback proteccion.

Oct 15, 2008 4 Replies

Hello everybody,



I'm a junior engineer. I need design a 600V DC supply. I have tree lineal converter of 1000V. And I need protect its because the maximum current is 1.5mA. I thought protect the power supply with a foldback circuit but is very difficult for me because I have very high voltage and very small current.



Something know what is a possible solution to foldback current? Or something else?



Thanks for all.


I have no idea what a "tree lineal converter" is, but I assume from the title that it is some sort of a DC to DC converter. If so, what is the input voltage? It may be possible to base the fold back on the input side current, instead of the output side current. It won't be as precise, but may serve.

Regards, John Popelish

ee

Hi,

the lineal converter is a device that connect 12V in the IN pin and you have 1000V in the OUT pin. This device has a power of 1.5W. I need

3 in paralel because I need 3.5mA. If you had a shortcircuit, it broke the device. The idea is protect the device with a fooldback circuit. I know to regulate the device at 600V. The problem is sense 3.5mA at 600V because I don't know any amplifier or device to sense at 600V.

Thanks,

Regards.

You seem to be inventing words to describe some kind of DC-DC converter.

In any converter, there is at least one more pin normally, from which the input and output voltages are measured.

There are two loops; one carrying input current and another carrying output current. It is possible to measure output current on the output loop by measuring the current on the lead returning to the zero-voltage reference. This will not, however, include fault currents that return to the source by another path.

If the converter has an isolated output, there will be four terminals, in which case current measured on the output return rail must pass through the output reference node, regardless of external fault paths.

RL

It sounds like a formula to estimate the number of usable board feet in tree.

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