Hi Pat:
> If a product is rated for 100-240Vac operation, this
> means test levels like 40Vac for 100ms (100Vac/50Hz
> nominal input, 60% dip for 5 cycles). The performance
> criteria makes this especially difficult - "The system
> shall provide essential performance".
>
> This looks like a major design change for many of our
> power supplies.
My health insurance premiums are going to go up!
The way I read the requirement, the power supply
output will need to be maintained through this
dip. Most power supplies cannot sustain the
output with input that low for that long a period.
The requirement does indeed imply a MAJOR design
change for "typical" power supplies. The 100 ms
time period (5 cycles) is really tough. For a
switcher, it means some really big capacitors in
both the rectifier and the output. It may also
mean the switcher will need to work at even lower
voltages.
The power supply will be bigger and more expensive.
Good luck,
Rich
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