Author Topic: How does the driving frequency affect the output of a flyback ?  (Read 204 times)

Offline Zyxel

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How does the driving frequency affect the output of a flyback ?
« on: October 09, 2021, 11:58:01 AM »
How does the primary winding driving frequency affect the output amplitude of a flyback's secondary winding ?

I heard that the secondary winding is resonant at some frequency. 
Should the flyback be driven at this frequency or away from it?.  What difference does it make to the output voltage and current ?

P.S.
I am working with a modern flyback with integrated diodes.


Offline alan sailer

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Re: How does the driving frequency affect the output of a flyback ?
« Reply #1 on: October 09, 2021, 03:44:20 PM »
In my experience with flybacks (both vintage and newer) they do indeed have a point of resonance at which the
output voltage goes to a maximum. This was in the tens of kilohertz for the flybacks I used.

I found that operating the flybacks at resonance was risky as it puts the maximum voltage stress on the secondary
insulation. I lost at least one flyback because of this.

In my circuit I ran the flyback below resonance. By changing the frequency of the drive circuit I could "ramp" up the
slope towards the resonance, thus controlling the output voltage. My application was driving homebuilt plasma tubes
so all my usable flybacks were AC. I messed with a few DC flybacks and they worked in the same way.

Cheers.

Offline Zyxel

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Re: How does the driving frequency affect the output of a flyback ?
« Reply #2 on: October 10, 2021, 08:38:09 AM »
Thanks for your reply.

Is there a method for finding this resonance frequency other than monitoring the high voltage at the secondary (e.g. by seeing at what distance the arc initiates) ?

Offline alan sailer

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Re: How does the driving frequency affect the output of a flyback ?
« Reply #3 on: October 10, 2021, 02:51:08 PM »
When I was working with my flybacks the resonance was always the point at which the current draw in
the primary went to a maximum. 

To avoid hurting the secondary it's a good idea to search for the resonant frequency with as low as
possible primary voltage.

Cheers.

High Voltage Forum

Re: How does the driving frequency affect the output of a flyback ?
« Reply #3 on: October 10, 2021, 02:51:08 PM »

 


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