A
aravind
- Jan 1, 1970
- 0
hi guys
I plan to use TVS diode as snubber for a ac-dc flyback converter, by
connecting TVS diode in parallel with the primary winding of the
flyback transformer so that TVS diode absorbs the transient energy
stored in the leakage inductance of the flyback transformer during
turn off of the switch. The rated output voltage of the converter is
50 V dc. The turns ratio of the transformer is 4:1. My rated power of
operation is 210 W. Switching frequency is 50KHz in CCM mode. During
transient my output voltage can go up to 80 V(worst case), and the
current in the switch might go up to 15 A(max during full load in
transient). Therefore I would require a TVS diode with a peak pulse
power dissipation (Ppp) of about 1.6*80*4*15 =7680 W with rated
working peak voltage (Vwm) of 80*4= 360. Since I could only get TVS
diodes with Ppp of 1500 W. I intend to put six TVS diodes of 1500 W
Ppp and Vwm 0f 60 V in series.
Can anyone suggest weather this idea will work, and will any special
measures have to be undertaken to for heat dissipation if the whole
ckt (other than flyback t/f) has to be implemented on a pcb.
I plan to use TVS diode as snubber for a ac-dc flyback converter, by
connecting TVS diode in parallel with the primary winding of the
flyback transformer so that TVS diode absorbs the transient energy
stored in the leakage inductance of the flyback transformer during
turn off of the switch. The rated output voltage of the converter is
50 V dc. The turns ratio of the transformer is 4:1. My rated power of
operation is 210 W. Switching frequency is 50KHz in CCM mode. During
transient my output voltage can go up to 80 V(worst case), and the
current in the switch might go up to 15 A(max during full load in
transient). Therefore I would require a TVS diode with a peak pulse
power dissipation (Ppp) of about 1.6*80*4*15 =7680 W with rated
working peak voltage (Vwm) of 80*4= 360. Since I could only get TVS
diodes with Ppp of 1500 W. I intend to put six TVS diodes of 1500 W
Ppp and Vwm 0f 60 V in series.
Can anyone suggest weather this idea will work, and will any special
measures have to be undertaken to for heat dissipation if the whole
ckt (other than flyback t/f) has to be implemented on a pcb.
