TIDM-02002: Measure SFRA Plant for Voltage Loop

user4308845

Part Number: TIDM-02002
Other Parts Discussed in Thread: SFRA,

SFRA Open Loop Plot for the Closed Voltage Loop, Sec to Prim Power Flow (Test condition：Vprim 400 V, Vsec 320V, Power 1 kW, Fsw 500 kHz)

I made a PCB according to the design of tidm-02002

Why does the waveform oscillate so much from 1kHz to 10kHz,

over 2 years ago

0 user4308845 over 2 years ago

Intellectual 475 points

This is Lab2 Measure SFRA Plant for Voltage Loop

0 user4308845 over 2 years ago in reply to user4308845

Intellectual 475 points

This is the test waveform of TI in “ZHCU647C”

0 Cody Watkins over 2 years ago in reply to user4308845

TI__Mastermind 41365 points

your control loop bandwidth appears to be a bit low. And your Gain Margin is probably larger than it needs to be. I would try retuning your control loop to and see if increasing bandwidth seems to help.

Regards,
Cody

0 user4308845 over 2 years ago in reply to Cody Watkins

Intellectual 475 points

How should I adjust to solve this problem, Firmware or hardware

0 Cody Watkins over 2 years ago in reply to user4308845

TI__Mastermind 41365 points

Start by adjusting your compensator, B0 B1, B2, A0, A1, A2. This can be done with Compensation Designer and should be outlined in this document here: https://www.ti.com/lit/ug/tidueg2c/tidueg2c.pdf?ts=1634602612274

Regards,
Cody

C2000™︎ microcontrollers

C2000 microcontrollers forum

TIDM-02002: Measure SFRA Plant for Voltage Loop