TIDA-00961： Calculations & Formula

user5265103

Prodigy 40 points

Part Number: TIDA-00961

Hi,

I am troubled that current calculations, boost inductor, switching elements.

Please tell me how to calculate this current.
Also, please tell me how to derive the formula.

Best Regards,

Jim

over 6 years ago

0 JohnFullilove over 6 years ago

TI__Expert 5130 points

Jim, hello and thank you for your interest in Texas Instruments reference designs. You query has been received and forwarded to our Power Delivery team. Unfortunately, the design is supported out of our Shanghai Chiina facility and the team is out of the office already for the weekend. Please allow us until Monday to get a response to you.

Best Regards,

J. Fullilove

Reference Design Operations

Texas Instruments

0 Desheng, Guo over 6 years ago in reply to JohnFullilove

TI__Expert 6730 points

Hi,

please refer to the TIDA-00961 design guide equation (7) and equation(8)

http://www.ti.com/lit/ug/tidudt3b/tidudt3b.pdf

it assume the inductor current is triangle wave (without negative reverse current),

and its average value of each cycle is same with the sine wave of input current at that line phase.

0 user5265103 over 6 years ago in reply to Desheng, Guo

Prodigy 40 points

and then,why the inductor RMS currents divided by √6 is the inductor peak currents? please tell me the details! Thx!

0 Desheng, Guo over 6 years ago in reply to user5265103

TI__Expert 6730 points

it assume the inductor current is triangle wave (without negative reverse current),

and its average value of each cycle is equal to the sine of input line phase.

you want to understand how to get it, may need to derive it by yourself, If you just want to double check the equation, you can do it by simulation tools.

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TIDA-00961： Calculations & Formula