[help] current sensing circuit

Discussion in 'General Electronics Chat' started by etiquoe, Nov 19, 2010.

  1. etiquoe

    Thread Starter New Member

    Jul 11, 2010
    i wanna make current sensing circuit for my 24 V bldc motor driver. i wanna use high side current shunt measurements as AN894 mentioned, but still confused about calculating the components value (Rsense, R1 and R2 for the op amp).

    my power inverter circuit is attached

    anyone help please..
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Your main DC supply is only 24V so you may not need a high voltage type op-amp.

    You need to state a couple of design goals.

    Do you want current sensing on all output phases or just one?
    What is the per-phase peak load current?
    What output voltage range do you require from the current sensing circuit - for the given peak load current range?
    How much power loss are you willing to tolerate in the sensing resistor(s)?
  3. etiquoe

    Thread Starter New Member

    Jul 11, 2010
    i want current sensing on all phases

    max. motor input current is about 3 A

    it will be read by ADC of microcontroller, so i need 0-5v

    need help/suggestion also for this :D
    Last edited: Nov 20, 2010