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AN3338 Datasheet(PDF) 33 Page - STMicroelectronics

Part # AN3338
Description  In recent years the variable speed motor control market has required high performance
PDF  72 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3338 Datasheet(HTML) 33 Page - STMicroelectronics

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AN3338
Electrical characteristics and functions
72
The sense voltage signals must be provided to an A/D converter. They are usually shifted
and amplified by dedicated op amps in order to exploit the full range of the A/D converter.
The typical scheme and principle waveforms are shown in
Figure 22:
Figure 21. 3-phase system
3-phase driver
Sinusoidal Vector Control
Sensing:
Discontinuous Voltage at f
PWM frequency
Discontinuous Voltage at f
PWM frequency
Power
stage
I
PHASE
AM09338v1
Figure 22. General advanced current sense scheme and waveforms



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