Regulator for 48volt 100 Amp power supply.

[[email protected]]

Can anyone please let me have a circuit diagram for a battery charger
regulator. It is a 5Kw unit running at 48 volts. I have the
transformer and bridge connected Diodes and need to regulate the DC
output using a Thryister circuit. Help appreiciated.

 

[BobG]

How about an Insulated Gate Bipolar Transistor with PWM on the gate?

 

[legg]

Can anyone please let me have a circuit diagram for a battery charger
regulator. It is a 5Kw unit running at 48 volts. I have the
transformer and bridge connected Diodes and need to regulate the DC
output using a Thryister circuit. Help appreiciated.

What is the rating and construction (phase count and label
voltage/current) of the transformer?

RL

 

[Ross Herbert]

On Wed, 23 Apr 2008 14:06:01 -0700 (PDT), [email protected] wrote:

:Can anyone please let me have a circuit diagram for a battery charger
:regulator. It is a 5Kw unit running at 48 volts. I have the
:transformer and bridge connected Diodes and need to regulate the DC
utput using a Thryister circuit. Help appreiciated.


What is the application, eg, forklift battery charger? The application may
affect the operating mode.

 

[Ross Herbert]

On Wed, 23 Apr 2008 14:06:01 -0700 (PDT), [email protected] wrote:

:Can anyone please let me have a circuit diagram for a battery charger
:regulator. It is a 5Kw unit running at 48 volts. I have the
:transformer and bridge connected Diodes and need to regulate the DC
utput using a Thryister circuit. Help appreiciated.


Designing and building a 48V, 100A battery charger is no trivial matter. It can
be done using single phase 240Vac input but the supply wiring from the
distribution board has to be specifically installed to handle the high current
involved. You can't just plug it into a general purpose 240V outlet.

For example, here is a datasheet for a modern switchmode 48V, 100A
telecommunications type battery charger
http://www.rtp.com.au/pdf/RT6-48V [W1426c].pdf (you will have to manually add
the square bracket part to the url)

You will see that even at 277Vac input the input current is still around 22A at
maximum load - and that model is extremely efficient. While your requirement may
not be so stringent, your own design may be less efficient and therefore draw
more input current for a given output than the model above. It may then exceed
the maximum allowable current draw from a 240Vac circuit.

 

[Rich Grise]

Can anyone please let me have a circuit diagram for a battery charger
regulator. It is a 5Kw unit running at 48 volts. I have the
transformer and bridge connected Diodes and need to regulate the DC
output using a Thryister circuit. Help appreiciated.

When I did this I used a 68HC11. It had 8x ADC inputs which I used to
monitor output voltage and current, and half a dozen setpoints - it
has selectable charge profiles, you see.

The circuit was almost trivial - I used a center-tapped transformer
and two SCRs. I monitored the charge voltage and current and a little
bit of firmware which decided, depending on what we were regulating at
the time, when in the next half-cycle to fire the SCRs. This could
probably be done in a full-wave bridge (xfmr not tapped) by adding a
couple of ordinary diodes.

So, get a uP of some kind, learn how to use it, and make a PWM
controller.

Or, contact me for my rates. ;-)

Another thing you could do is specify a ferroresonant transformer,
and the tranny itself will do the regulating.

Good Luck!
Rich

 

[Vladimir Vassilevsky]

When I did this I used a 68HC11. It had 8x ADC inputs which I used to
monitor output voltage and current, and half a dozen setpoints - it
has selectable charge profiles, you see.

The circuit was almost trivial - I used a center-tapped transformer
and two SCRs.

BTW I know a company which makes the SLA chargers very similar to that.
However all control is done by the analog circuit. It does the typical
charge profiles very well, and even takes the temperature into the account.

I monitored the charge voltage and current and a little
bit of firmware which decided, depending on what we were regulating at
the time, when in the next half-cycle to fire the SCRs. This could
probably be done in a full-wave bridge (xfmr not tapped) by adding a
couple of ordinary diodes.

So, get a uP of some kind, learn how to use it, and make a PWM
controller.

The most important thing is that the charger should survive if the
battery was connected in the reverse polarity


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

 

[Rich Grise]

Rich Grise wrote: .... ....

BTW I know a company which makes the SLA chargers very similar to that.
However all control is done by the analog circuit. It does the typical
charge profiles very well, and even takes the temperature into the account.

When I got called in on this one, some other guy had done the whole thing
in analog, except that he used MOC3030 optoisolators, apparently thinking
that he could do phase control with zero-crossing triacs. ;-) (or he
didn't know the difference!)

Cheers!
Rich

 

[mohamedtouma]

Can any one help me to have a circuit diagram for 110v dc 5Amp not regulator to 110v dc regulator .