TMS320F280049C: HRPWM variable frequency control with LLC control?

Shaoxing Ke

Part Number: TMS320F280049C

Hi Champs,

I am asking for my customer.

Customer are using the enabled high-resolution period control (HRPCTL[HRPE]=1) as below:

Once update the TBPRDHR, the HRPWM frequency would be uncertain. Any thing missed? Or restrict to the variable frequency control?

Could you give me the reference code？

over 3 years ago

0 Yogeshwaran Shanmugam over 3 years ago

TI__Prodigy 500 points

Hi User,

Please expect a couple of days delay for our expert to analyze and respond due to holiday on 4th Jul 2022.

0 Subrahmanya over 3 years ago

TI__Mastermind 24095 points

Hi,

What exactly do you mean by "frequency would be uncertain"? Is there a change in the frequency?
Is the customer using variable frequency control?

0 Shaoxing Ke over 3 years ago in reply to Subrahmanya

TI__Expert 3590 points

Hi Subrahmanya,

When using HRPWM with a variable frequency drive we need to provide a sync signal every time we adjust the frequency, there is a jitter when the sync pulse happens. So how to solve it?

0 Subrahmanya over 3 years ago in reply to Shaoxing Ke

TI__Mastermind 24095 points

Hi, Continuous synchronization should not be done in case of variable frequency applications (using HR). You can disable the synchronization in general and enable and apply a sync pulse only when frequency is changed, enable sync for that cycle only.

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TMS320F280049C: HRPWM variable frequency control with LLC control?