Low Power, High Efficiency Design

Posted by: slight on 04/17/2015

Hello, I have used the PI Expert SW to create a design with a 100-300VAC input and 14VDC/0.2A output. Using LNK623.

The simulation indicates that the efficiency should be about 80%. I assume this is at full output. In my application, I need high efficiency at low output power too. (Say 0.02A output.) Do you have any suggestions on how to ensure the efficiency is as high as possible at this output level. (And also how to get an idea of what efficiency I might get from a given design in PI Expert?)

Thanks for the help.

Comments

Thanks for Posting your question. First please prepare a prototype as per your specifications as the PI Expert Recommended Circuit. Optimise the Power Supply design as much as you can to achieve Higher Efficiency at full with PI Expert Software. The Build a Prototype , perform the efficiency and see what are you getting at your low power Output. Once you have the schematic and the data , then we can help you how to achieve higher efficiency.

Regards,

PI-KSAN

Thanks, but I am not willing to go to that expense having no idea whether the supply will meet my requirements. I am looking for some general advice on improving efficiency first. I have a similar existing design using the TNY284 and its efficiency at lower loads is very poor (30-40%). If starting from that design helps you to provide advice, we can do that. But, I can't post the design on a public forum. Please advise how I can share the design privately.

Thanks, If you are not comfortable in sharing the design using our forum. Please contact our Local Sales office near to you so that they will provide the necessary help regarding sharing your design information and the issues that you are encountered.

Regards,

PI-KSAN