Electronics > Beginners
high voltage electronic load = resistors + NPN transistor
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001:
Hi
I need for simple load to test supply 400V 0-0.4A
Can I use common 30V transistor load and power resistor in series?
ArthurDent:
You will still be connecting a 400 VDC power supply to your 30 VDC electronic load. The resistor will only limit current, expect problems
001:

--- Quote from: ArthurDent on November 05, 2018, 09:00:49 pm ---You will still be connecting a 400 VDC power supply to your 30 VDC electronic load. The resistor will only limit current, expect problems

--- End quote ---

You misunderstood me

For example
can I  set load for 0.5A at 30V and add 370/0.5=740 Ohm resistor in series?
ArthurDent:
I understood. Putting any resistor in series with your 400 VDC supply will not prevent anything you connect to the supply from seeing 400 VDC, even for a split second.

If you're going to add a resistor anyway why not just use the proper value resistor (800 ohms) and remove the electronic load from possible destruction. 
001:

--- Quote from: ArthurDent on November 05, 2018, 09:30:30 pm ---I understood. Putting any resistor in series with your 400 VDC supply will not prevent anything you connect to the supply from seeing 400 VDC, even for a split second.

If you're going to add a resistor anyway why not just use the proper value resistor (800 ohms) and remove the electronic load from possible destruction.

--- End quote ---

To trim load from 0 to 100%
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