topic Frequency modulation in LPC824 in LPC Microcontrollers

Frequency modulation in LPC824

ranjithshanbhag — Tue, 04 Apr 2017 15:13:40 GMT

Hi Kerry,

Hope you are doing good.

I am using LPC824 controller. I am using COUNT_L and COUNT_H to generate 2 different PWM's. My Carrier Frequency is 100KHz and modulated frequency need to vary from 3K to 50K. but i am not able to move ahead from 14K. Please suggest me how to solve this ?

Please find the attachment for code.

Original Attachment has been moved to: PWM-code.txt.zip

Re: Frequency modulation in LPC824

kerryzhou — Wed, 05 Apr 2017 11:11:05 GMT

Hi Ranjith Shanbhag,

I am good, hope you are fine too!

Now confirm your question again, do you mean you can't get 14Khz PWM frequency with SCT?

Please clarify it, then I will help you to calculate and test it.

Have a great day,
Kerry

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Re: Frequency modulation in LPC824

ranjithshanbhag — Wed, 05 Apr 2017 11:26:30 GMT

Hi Kerry,

i am also good!

During frequency modulation, modulated frequency i want to vary from 3KHz to 50KHz. I am increasing modulated frequency from 3KHz and able to reach till 14KHz. It is not increasing, once it is reached to 14KHz.

Hope you understood my problem.