UCC28951-Q1: EV charger station Design
Part Number: UCC28951-Q1
I am also designing a Battery charger, for that i need to desig a PSFB using UCC28951-Q1. I just want to ask is PSFB Using UCC28951-Q1 can give the CV/CI profile for battery charging.If the answer is yes. Then can you please suggest how should be the Control loop designed in reference to the Battery SOC.
Thanks for your interest in UCC28951-Q1. Yes, you can implement a CV/CC charging profile. This is typically implemented as two feedback loops on the secondary. One controls the max output voltage, the other controls the max output current. This presentation provides a high level overview of battery charging:. . Page 5 shows the feedback structure necessary for CV/CC charging.
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In reply to Benjamin Lough:
Thanks for your reply on my query. i have refereed the document which you have send. But in that it is mentioned that the system goes in CV/CC Mode automatically, where as in my case i have to operate the system in CC/CV mode based on my commands to the system. i.e the system should operate in CV mode when i want to make it operate in CV mode and it should operate in CC mode when i want to operate it in CC mode.So can you please suggest me how can i achieve that using the same IC UCC28951-Q1.
In reply to Digvijaysing Rajput:
You would use the same structure but make the reference in the current control loop programmable through a MCU. You can set the reference appropriately to regulate the current across the sense resistor when you want CC mode. You can make the reference larger in order for the CV loop to take over when you want CV mode.
Thanks for the reply on my query related to operating PSFB using UCC280951 in CC/CV mode..But again one query i have , is that as per the document you shared before, it is said that the lower error value at the output of both the error amplifier wins and then that signal is given to EA+ pin.Now who ever wins in both the case the signal given to the EA+ is in voltage form , so how it is going to generate the Constant voltage or Constant current profile at the output. Is there any logic in the internal circuit of the IC , that if the voltage at EA+ pin is in particular range then it will operate in CV mode and beyond or below that range the IC will generate the CI output.
Thanks for your reply.
Do we have to connect Rsum to Ground when to operate in CC mode, and when to operate in CV Mode do we have to connect Rsum to Vref.
Just want to know does PCM and VCM mode play any role during CC/CV Mode.
Thanks for your replies on all my queries.Ill get back to you again if i have any doubt.thank you once again.
Can you suggest the idol test procedure to follow for the testing of PFC followed by PSFB Ckt using UCC28070 & UCC28951-Q1.
your suggestion will be highly appreciated.
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