Question

You are measuring the AC current of a 3-phase motor drive. The current is sinusoidal. The measurement needs to be fed to the A/D of a microcontroller, the A/D expects a voltage in the range 0...4 V. The maximum current to be measured is 130 A peak. You are using the current sensor with the attached spec. 1. Show a block diagram of the whole sensor/interfacing circuit. Make it explicit and accurate. 2. Sketch all the signals involved (the current to be measured, the output of the sensor, the input signal to the amplifier, the output signal of the amplifier). 3. Design the amplifier. Show the voltage coming out of the amplifier 4. On the same graph, show the current to be measured and the signal received by the A/D. When the current is 20 A, what is the exact voltage received by the A/D?

          You are measuring the AC current of a 3-phase motor drive. The current is sinusoidal.
The measurement needs to be fed to the A/D of a microcontroller, the A/D expects a voltage in
the range 0...4 V.
The maximum current to be measured is 130 A peak.
You are using the current sensor with the attached spec.
1. Show a block diagram of the whole sensor/interfacing circuit. Make it explicit and accurate.
2. Sketch all the signals involved (the current to be measured, the output of the sensor, the input
signal to the amplifier, the output signal of the amplifier).
3. Design the amplifier. Show the voltage coming out of the amplifier
4. On the same graph, show the current to be measured and the signal received by the A/D.
When the current is 20 A, what is the exact voltage received by the A/D?

You are measuring the AC current of a 3-phase motor drive. The current is sinusoidal.
The measurement needs to be fed to the A/D of a microcontroller, the A/D expects a voltage in
the range 0...4 V.
The maximum current to be measured is 130 A peak.
You are using the current sensor with the attached spec.
1. Show a block diagram of the whole sensor/interfacing circuit. Make it explicit and accurate.
2. Sketch all the signals involved (the current to be measured, the output of the sensor, the input
signal to the amplifier, the output signal of the amplifier).
3. Design the amplifier. Show the voltage coming out of the amplifier
4. On the same graph, show the current to be measured and the signal received by the A/D.
When the current is 20 A, what is the exact voltage received by the A/D?

Added by Bonnie R.

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