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Dorian,
I beleive the cap is there to ensure that there is no dc on the GDT in
between bursts. It also protects the drivers in a fault condition.
The resistor is these to ensure that the capacitor is discharged at the
beginning of the burst, otherwise the first "starter" pulse may be
charging an already charged capacitor and therefore not passing any
current for 1/2 a cycle via the GDT. (This assumes that a tristate
driver is being used, this isn't an issue with non tri-state drivers.)
Derek
On 21/07/2014 10:06, Dorian Black wrote:
Hi,
Looking at Steve Ward's UD driver, there's a capacitor shunted with a small resistance at the output of the MOSFET driver pair leading to the GDT. Any idea what purpose this resistor serves? The capacitor is to decouple DC as I'm presuming, but how does that work with this parallel resistor in place?
Many thanks.
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