SMPS Design Help

[jon]

Hello All,

I need to design a high voltage (500V) current controlled power
supply. When I say current controlled, I mean that I need to adjust
the current output between 0 and 10 Amps (more would be even better).

AC Input: 3 phase 208V (480V is available).

Can anyone please recommend (suggest) the best topology to use?

I need ripple free (very low AC ripple) DC (current and voltage).

I need to charge a battery that when discharged is as low as 300VDC
and when fully charged is at 490VDC.

Thank you,

Jon

 

[jon]

Please try to quantify this.

Battery charging often tolerates (or even improves with) ripple.


What should the current do when the output sees a short circuit?

I am aware that some batteries like AC ripple; however, new
chemistries (Li-Ion) and old (NiMH) do not like the ripple.

When I short circuit is seen by the charger the peak current should be
10 Amps or to the current set-point.

Thanks,

 

[jon]

(snip)

So, how much ripple, either in peak to peak amperes or % of
max current.  There is a big difference in the design of a
10 amp regulator that has 1 amp, peak to peak ripple and one
that has 1 mA peak to peak ripple.  "Low ripple" is not a
specification.

Hello John,

On a 10 Amps of current I can accept no more than 10 mA (5 mA or less
would be ideal).

Thank you,

Jon

 

[legg]

On a 10 Amps of current I can accept no more than 10 mA (5 mA or less
would be ideal).

Could you supply a battery part/type reference that justifies this
ripple current limitation, while still tolerating 10A continuous
charging levels?

There are not many 300-500V loads that will draw current with only a
0.1% ripple component. They may require a low supply noise level, over
specific frequency bands, but that is a different issue, that could be
addressed with local post-regulation, independant of the actual
converter, at moderate power levels.

If this is an EMC consideration, you might specify a standard that
allows larger current at the lower power conversion frequencies.

RL

 

[[email protected]]

Could you supply a battery part/type reference that justifies this
ripple current limitation, while still tolerating 10A continuous
charging levels?

There are not many 300-500V loads that will draw current with only a
0.1% ripple component. They may require a low supply noise level, over
specific frequency bands, but that is a different issue, that could be
addressed with local post-regulation, independant of the actual
converter, at moderate power levels.

If this is an EMC consideration, you might specify a standard that
allows larger current at the lower power conversion frequencies.

RL

Remember the battery burping chips? Now there is ripple for you.

 

[JosephKK]

Hello John,

On a 10 Amps of current I can accept no more than 10 mA (5 mA or less
would be ideal).

Thank you,

Jon

Another thing to think about in batteries that large is periodic
"equalization" charge cycles.