How much of the specified surge will pass through the filter your proposing to use? I'm wondering if a 2 stage filter with bidirectional Transorb after the filter will be sufficient enough to protect the controller. I'm thinking something along the lines of 5.0SMDJ33CA https://www.littelfuse.com/media?re...lename=littelfuse-tvs-diode-5-0smdj-datasheetHi,
We are doing a Full Bridge, 10-36vin, 32vout, 300wout, 125kHz.
The input will see surges to MIL-STD-1275E and also DEF STAN 61-005 Part 6.
The LTC4364 is the beefiest of all offTheShelf surge protectors, but isnt capable of handling these standards' surges. Do you know of any that do, or are we looking at a home brew circuit only?
LTC4364
MIL-STD-1275E
DEF STAN 61-005 Part 6
Thanks, all of it....its quite a long term surge......up to 175VDC for 100ms. then tails down from there for the nxt 400ms...so the SMPS must still provide full load throughout this surge. This isnt really a surge we can clip, realistically.How much of the specified surge will pass through the filter your proposing to use?
Apologies i missed that.Datasheet for DPG30C300PB IXYS Rectifier Diodes | Octopart
View and download the latest IXYS DPG30C300PB Rectifier Diodes PDF Datasheet including technical specificationsoctopart.com
@ scope-probe: the clamp power has been calc above - for 100mS it is far from trivial
a good filter - which are all LC based - can only smear out the impulse over time and thus reduce the peak height via this method - for the energies involved here the size of such a filter will be onerously large unfortunately - and would adversely affect the dynamics of the control of the following stages.
Oops - 10A10 diode ( x 4 in // )
400A each for 8.3mS = enough to upset any external battery wires / fuses
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@ scopeprobe - those solutions are fine until you have to carry 30A input at reasonably low losses ....
Doh, my bad. Late here. Your correct@ scope probe:
0.022 ohm x 30^2 = 19.8 watts, so 5 devices needed to get to 4 watts overall, and then you need a high side gate drive for N type fets .... and level shifted control.
...Thanks, ill consider that for use as the "bypass FET". (or rather, many of them on pllel).Not used them before unfortunately but some low RDS mosfets shouldn't give too much losses @ 30A
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