110V regulated power supply
I want to develop a power supply which has 3 outputs 55V(300mA),55V(300mA) and 12 volt(1A). I have generate a schematic using PI expert which is attached herewith. I want to connect two 55volt o/p serially to get 110V regulated output. PI expert software recommended to use TOP271EG with efficiency optimization. Will this circuit work or i have to modify the schematic. Please give your comments about the circuit.
Comments
My design specification is:
INPUT: 70-136VDC
OUTPUT1:110V (2 55Volt in series as PI expert does not support 110V output)300mA
OUTPUT2: 12 Volt 500mA
Tolerance : 2% maximum
constant voltage
Please give me some suggestion about the schematic.
I would probably configure PI Expert slightly different. I've attached a PI Expert file with what I came up with. My thinking is that a +/- 55V with common return might make more sense.
When he gets back from lunch though, I'll stop by and chat with the resident PI Expert guru and see what he says. (He happens to be my boss)
-The Traveler
Thank u very much i will change my file according to your pi expert file. Please inform me if you get any updates from your PI expert guru
Abhisek -
I spoke with the resident PI Expert guru. Coincidentally, I believe you already got a response from him in the PI Expert support forum.
There are a couple different ways to attack this problem.
1.) Use PI Expert to come up with a 12V 500mA and 100V 330mA power supply. This will have PI Expert automate most of the design choices for you. The important part is having it do the rough design of the transformer. Once you have the PI Expert design, you can use most of the information from the PI Expert design to do a manual design in PI XLS. PI XLS will happily let you create a 110V output. You'll then just fill in most of the gray entry fields with values created in the PI Expert design.
2.) Use PI Expert to design a three output power supply (12V and +/-55V). Configure the 55V outputs as "Common Return" under the "stacking" menu on the left hand side of the software. When you build your actual design, you'll have the two 55V secondary windings configured in series and won't use the common ground return. You will also need to choose an appropriate output rectifier, bulk caps, etc.
Regardless of which method you choose, you will want to use the 110V output for your control loop feedback since it's the highest power output of the supply. With the 110V output, you'll probably have trouble finding a voltage reference (TL431 or other) and optocoupler rated for that high of a voltage. A simple solution for this problem is to use a zener diode in the feedback path to bring the voltage level down. If you do a search in the support forums, this scenario has been discussed before.
If you need any further assistance, please let me know.
-The Traveler
Abhisek Sengupta -
I'm not sure I would setup the circuit the way you have.
Can you send me the following:
-PI Expert files you used to create this design.
-Your specific design requirements (voltage regulation requirements, ripple, etc)
-Any other spec information important to your design (floating outputs, AC/DC stacked outputs, separate ground environments, etc)
-The Traveler