Author Topic: GDT minimum frequency  (Read 236 times)

Offline costas_p

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GDT minimum frequency
« on: November 21, 2021, 06:27:03 PM »
Hello all, I designed my version of a to247 h bridge based on loneocean's "80mm full bridge plus".

As GDT i choose to use the P0584NL part.

According to the datasheet it has a max value ET of 94 VuS.

And considering loneoceans equation for finding the lowest frequency you can run the GDT before core saturation: ET(Vus) = V_gatedrive * Duty Cycle/Frequency(Mhz)
So for 24v gate drive and 50% duty cycle I calculate lowest frequency to be ~127kHz
So, this 127kHz is the lowest possible frequency I can run the primary coil without saturating the GDT?
Also, loneoceans uses 50% duty cycle for his calculation, isn't supposed a DRSSTC to operate with duty cycle around 5%? What have I not understood correctly?

gdt datasheet in attachments
Papadakis Costas

Offline klugesmith

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Re: GDT minimum frequency
« Reply #1 on: November 22, 2021, 12:24:39 AM »
The duty cycle that matters is that of the drive waveform _during_ each RF burst.
Typically 50% or a little bit less.

For example, at 127 kHz, each half cycle is about 3.94 microseconds.   Multiply by 24 V, that gives you almost 95 volt-microseconds, which matches ET parameter in the datasheet you referred to.  You could run at half the frequency if the drive voltage were 12 V.

Numbers like 5% or 1% sound like ratio of RF burst length to interval between bursts.  That matters for heating, but not for GDT core saturation.


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Re: GDT minimum frequency
« Reply #1 on: November 22, 2021, 12:24:39 AM »

 


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