[Milsurplus] [ARC5] Quieting A DC/DC Converter

[Richard]

Understand that the primary purpose of fuses is not to protect internal 
components, but to isolate the fault from the power source and not burn 
your house down.  Further, fuses aren't fast. they will blow 
"eventually" at 135% of rating, (minutes to hours) about two minutes at 
200%, and about five cycles with a good short.

Richard, AA1P


On 01/21/2018 04:22 PM, Bob kb8tq wrote:
> Hi
>
> The gotcha with fuses as protection for something like this is that 
> the fuse is likely
> to be protected by the inverter dying. Coming up with proper (high 
> speed) protection
> is something that can be done. It just adds cost ….
>
> Since this is a square wave, the transformer and how it interacts is 
> *not* a simple thing.
> Load removal may be an “interesting” event right along with shorts. 
> Often things get
> tuned with R/C networks to calm it all down. Again, not life or death. 
> Just more parts
> and a bit more time playing with the design.
>
> Bob
>
>> On Jan 21, 2018, at 3:26 PM, Military Wireless Museum 
>> <military1944 at aol.com <mailto:military1944 at aol.com>> wrote:
>>
>> Subject: Re: [ARC5] [Milsurplus] Quieting A DC/DC Converter
>> Hi
>> Equally to the point:
>> Are there enough people interested to fund a run of 50 or so 
>> transformers to get the cost
>> down out of the stratosphere?
>> Also worth noting:
>> The circuit we have been looking at is a full open loop square wave 
>> source. There is no
>> protection of any sort anywhere on the board. As it’s done right now, 
>> the first time there
>> is a short (or other fault) is the last time for that board. If you 
>> are going to design from
>> scratch, how much protection do you want to add?
>> Bob
>>
>>
>> I would be interested, depending on the cost of course.
>>
>> Fuses. I think any competent builder would fuse the input line and 
>> the tranny feed.
>>
>> Ben.
>>
>>
>>
>>
>
>
>
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