Cypress FM3 Series Manual - Página 11

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Cypress FM3 Series Manual

3. Hardware

3.1

Amplifier Circuit for Phase Current

This solution employs two shunt resistors to measure the phase current of a motor. Accordingly, two channel of
amplifier are needed to extend the range of current waveform and lift the middle point of current waveform from
ground to 2.5V.
Figure 5
shows the detail of amplifier circuit.
= 2.5 + �
Compute the voltage of current waveform as follow:
Where:
FM3, MB9AF110K, 32-Bit ARM® Cortex® - M3 Washing Machine Evaluation Board, Doc. No. 002-04443 Rev. *A
142
� ∗
129
= amplified voltage
= voltage between shunt resistor
Figure 5. Amplifier Circuit
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