Hi all
I am looking to design a power converter (which topology is what I'm unsure about would be better if I could simulate it in LTSpice) with input of 12V and outputs -175V and has a dynamic load that goes from no load to -175V I need the output voltage to be constant regardless of the load. Any help would be greatly appreciated.

Kind Regards

Art

 

... outputs -175V and has a dynamic load that goes from no load to -175V I need the output voltage to be constant regardless of the load...

You could start by explaining what you mean by that load going from no load to some voltage. Load is usually specified as current or resistance, so could it be that 2.14A is the full load?
As for topology, a two-switch forward is probably the easiest way to go, but you need to design your own transformer.

 

You could start by explaining what you mean by that load going from no load to some voltage. Load is usually specified as current or resistance, so could it be that 2.14A is the full load?
As for topology, a two-switch forward is probably the easiest way to go, but you need to design your own transformer.

Sorry this converter will be providing a voltage source to several switching devices to different loads so the load that the power converter sees will change constantly but I need the voltage to be constant and only the current delivered to be changing. Do you have a suggestion of a controller that I can use to design/simulate the two switch forward converter? The transformer won't be an issue this is something I will get manufactured externally I just have to give them a spec.

 

If you want to simulate it easily, then I wold simply go to linear.com and choose some of their products, and then use ltspice to simulate it.

 

If you want to simulate it easily, then I wold simply go to linear.com and choose some of their products, and then use ltspice to simulate it.

what if I used a fly back converter using the LT3757A

 

At that power level I think you will have very bad efficiency and high losses with flyback.

 

At that power level I think you will have very bad efficiency and high losses with flyback.

ah ok this is going to be tricky there seems to be a large lack of resources to help with the design of these power converters

 

There is a lot of resources, but you have to go through all of them to get it done right. For example switching power supply design 3rd edition by L Pressman is a nice book and you should be able to find a pdf somewhere.
Also this page has a nice calculator to get you the rough numbers to get started with your particular case http://schmidt-walter-schaltnetzteile.de/smps_e/smps_e.html

 

There is a lot of resources, but you have to go through all of them to get it done right. For example switching power supply design 3rd edition by L Pressman is a nice book and you should be able to find a pdf somewhere.
Also this page has a nice calculator to get you the rough numbers to get started with your particular case http://schmidt-walter-schaltnetzteile.de/smps_e/smps_e.html

Thanks