UCC28070: UCC28070 related issues

jeno.zhang

Part Number: UCC28070

Hello，

Is it feasible to use UCC28070 as a three-phase PFC, first rectifying the rectifier tube and then connecting the PFC circuit?

The customer can only achieve a PF value of 0.95 when using this solution for testing, why?

Thanks！

over 2 years ago

0 Harish Ramakrishnan5 over 2 years ago

TI__Mastermind 24375 points

Hi,

Thank you for the query on UCC28070.

It should be possible to UCC28070 in three phase configuration as shown in the figure below. But we do not have any solution demonstarting this configuration.

Visio-Drawing1 (1).pdf

It can also be used in a delta connected boost with a 6 diode bridge rectifier and it has been used in this configuration by many customers. The problem with this configuration, could be, is that the line currents will be more like a square wave than a sine wave and you may find that you will not be able to meet harmonic limits and PF tas may be required.

You might want to check VINACave a huge DC offset as it requires the signal to fall below 0.7V every cycle for Kvff update. Please refer the attachment for details:

3157.Designing with 3 phase PFCs.doc

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/769760/ucc28070-3-phases-pfc-based-on-ucc28070?keyMatch=THREE+PHASE+PFC

Regards,

Harish

Power management

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UCC28070: UCC28070 related issues