TMDSHVMTRPFCKIT: Question about TMDSHVMTRPFCKIT

F.F

Part Number: TMDSHVMTRPFCKIT

Dear team:

Can you explain the principle of current sampling circuit to me according to the circuit diagram of 28335 motor kit? That is to say, what is the process of converting the actual current into ifb-v?

Best regards

over 5 years ago

0 Ramesh Ramamoorthy over 5 years ago

TI__Mastermind 27240 points

The voltage across current sense (SHUNT) resistors is amplified by the operational amplifiers. This voltage signal is representative of the motor current when the inverter bottom switch is ON. Therefore, sampling of this signal is during the middle of PWM off time when the top switch is OFF and bottom switch is ON.

0 F.F over 5 years ago in reply to Ramesh Ramamoorthy

Genius 3095 points

Dear Ramesh:

That is to say, only the current when the bottom switch is connected is calculated. How to calculate when the top switch is connected and the bottom switch is closed? Isn't it necessary to calculate the current of top and bottom switch for single-phase current?

Best regards

0 Ramesh Ramamoorthy over 5 years ago in reply to F.F

TI__Mastermind 27240 points

It depnds on the sampling method. If only one current sample is needed per PWM cycle, which is what most drives do, this method is sufficient. If you require two samples per cycle, then you may have to do what you said and for that this hardware will not support.

0 Ramesh Ramamoorthy over 5 years ago in reply to Ramesh Ramamoorthy

TI__Mastermind 27240 points

If your query is resolved, can you close the thread. Thanks.

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TMDSHVMTRPFCKIT: Question about TMDSHVMTRPFCKIT