Exporting Transformer Design Specification as Text

Andrew Baker · ‎2018-05-14

Posted on May 14, 2018 at 14:20

I've just used EDesignSuite to design a Flyback PSU based around a L6566B

As part of this, it has designed me a transformer, in around half a page of small, poorly formatted, dense, closely type text.

How do I export this text so as to send it off to be made? It does not seem to be possible to get it out in any useful form?

(Printed page is NOT 'useful' in this context)

Surely you do not expect me to slowly, tediously and laboriously re-type all this text, probably introducing expensive errors as I go?

#transformer-export-design-as-text

Patrizia BELLITTO · ‎2018-05-16

Posted on May 16, 2018 at 11:29

Hi Andrew,

about the thermal issues, consider that thermal analysis for these designs is calculated at the worst conditions and the losses are overestimated. It is a known issue and we are working to fix it.

Regarding the optocoupler, we provide the general series and the CTR ratio.

If you need more details, give a look to the application notes available for that product.

However, I'm forwarding your question to the product application engineer, we'll give you more feedback as soon as possible.

Regards,

Patrizia

Andrew Baker · ‎2018-05-16

Posted on May 16, 2018 at 12:01

In the designs I've done in the last couple of days, the ONLY thing it

has given isthe CTR = 1. Absolutely nothing else.

(Also no information on the reference.)

There are few optos with a CTR of 1, and the ones that exist have a very

wide range of CTRs in the datasheet, typically, between about 80% and

500%. So without information about what range of CTR will work, the

information given isn't really useful.

Currently I am going with a design based on a VIPer37HD which looks

reasonable.

If an application engineer is willing to help me - the total need is

PFC: 185V to 265V AC, 400V DC output at 2.5kW. based on ST STNRGPF01

Completely independently of that (because the above must be switched):

Unisolated supplies:

15V@200mA,

12V@200ma (probably less, it's only to power the cooling fan),

5V@200mA

3.3V@200mA

Amongst other things, these supplies power the eletronics for the PFC.

Current design based on VIP16HD and L5963Q. I would be delighted to find

a chepaer, simpler design perhaps based on a multi-winding transformer,

we have no problems gettting a transformer specially made. Any pointers

here would be great.

Isolated supplies:

15V 200mA - Analogue Electronics.

12V 1A - to power an small, external motor.

5V 200mA - logic etc.

3.3V 200mA - STM32 processor and associated electronics.

Again, I have a current design based on VIPer37HD and L5963Q

Again, pointers to a cheaper, simpler multi winding design would be great.

I'm quite happy with the idea of a PSu which produces roughly regulated

otuputs which are then 'cleaned' up bby LDOs for the 5V and 3.3V outputs.

If you can pass this on to the best person it ST, that would be great.

A.

Patrizia BELLITTO · ‎2018-05-16

Posted on May 16, 2018 at 13:28

In the BOM you can see that the opto is a PC817 series.

However, you will be contacted soon by someone from the regional support.

Regards,

Patrizia

Andrew Baker · ‎2018-05-16

Posted on May 16, 2018 at 15:06

Thanks for the reference:

I've just checked now, and I have in front of me a design from

EDesignsuite based on a L6566B SO 16-N. 185V to 265V AC in,

15V 18W out

The only information on the schematic is 'OPTO CTR: 1'

The only information which appears in the BOM when you print it out is

'OPTO CTR: 1 Optocoupler - CTR: 1'

And if I save the BOM as an XML file and open it in Excel I get:

OPTO CTR: 1 Optocoupler Optocoupler - CTR: 1

---

The information for the reference device also also simalarly unhelpful.

So I think there is still a problem buried deep there which needs

looking at. What is present it not simply now a viable design - it

leaves a major, complex and vital lump of the design unresolved.

A.

Patrizia BELLITTO · ‎2018-05-18

Posted on May 18, 2018 at 14:07

Hi Andrew,

I contacted you privately, I'm waiting your answer to redirect you to the right people in ST.

Regards,

Patrizia