Hi,
I intend to use an e-choke (mosfet) or gyrator in my high voltage (625 Volt) power supply instead of a traditional bulky choke (coil).
So far I see no smoke, no electric failure or other weird things. I'm wondering how should I test this device? How can I measure it's performance?
Regards, Gerrit
I intend to use an e-choke (mosfet) or gyrator in my high voltage (625 Volt) power supply instead of a traditional bulky choke (coil).
So far I see no smoke, no electric failure or other weird things. I'm wondering how should I test this device? How can I measure it's performance?
Regards, Gerrit
If you have a scope, check whether its input coupling cap can handle 625 V and if it can, measure the power supply ripple in front of and after the choke? If it can't handle 625 V, make your own RC networks to block the DC and connect the scope after everything has settled.
You need to use a resistive divider Before the scope DC blocking capacitor. That is because at start up, the blocking cap will act like a short (it is not charged yet). It will have the full 625V across it until it charges, and so will the scope input transistor/JFET if you have the sensitivity (V/div) set to low values.
High voltage probes not only have a high resistance series resistor, they also have a 110k Ohm resistor across the probe output (111k in parallel with the scope input 1 Meg = 100k Ohms).
High voltage probes not only have a high resistance series resistor, they also have a 110k Ohm resistor across the probe output (111k in parallel with the scope input 1 Meg = 100k Ohms).
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