i am trying to stop the transients on my transformers secondary from charging my capacitor (C2) up to the peak transient voltage.
The dc-dc converter has a max dc input voltage of 75V, however C2 jumps from 36V to 80V when im switching my load at 30+ KHz.
I have purchased a unidirectional TVS diode to put across the capacitor in question.
But i then realised that when the polarity of the transformer output alternates, the TVS would short out C2 every cycle.
I was hoping i could put a diode in series with the TVS diode to block the reverse polarity of the supply, if this will work that is.
Then this got me thinking - what about my zener diodes? are they acting as a short when the lower supply line goes negative, causing C3 to discharge and then subsequently re-charge from C2?
I have noticed the resistor R1 getting very very hot but i had put this down to the potential difference between my 24V C3 and the 80V of C2 - but if C3 is shorting via the zeners every cycle, then the additional current flows through R1.
In summary:
Will i be able to prevent my capacitor charging to the transient voltage level if i use TVS diode with a rectifier diode?
Would it also be recommended to put a rectifier diode in with the zener diode to block the reverse polarity of the supply?
Thanks!
The dc-dc converter has a max dc input voltage of 75V, however C2 jumps from 36V to 80V when im switching my load at 30+ KHz.
I have purchased a unidirectional TVS diode to put across the capacitor in question.
But i then realised that when the polarity of the transformer output alternates, the TVS would short out C2 every cycle.
I was hoping i could put a diode in series with the TVS diode to block the reverse polarity of the supply, if this will work that is.
Then this got me thinking - what about my zener diodes? are they acting as a short when the lower supply line goes negative, causing C3 to discharge and then subsequently re-charge from C2?
I have noticed the resistor R1 getting very very hot but i had put this down to the potential difference between my 24V C3 and the 80V of C2 - but if C3 is shorting via the zeners every cycle, then the additional current flows through R1.
In summary:
Will i be able to prevent my capacitor charging to the transient voltage level if i use TVS diode with a rectifier diode?
Would it also be recommended to put a rectifier diode in with the zener diode to block the reverse polarity of the supply?
Thanks!
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