3-Phase Pwm Unit - Analog Devices ADSP-BF506F Hardware Reference Manual

3-Phase PWM Unit

The processors integrate two flexible and programmable 3-phase PWM
waveform generators that can each be programmed to generate the
required switching patterns to drive a 3-phase voltage source inverter for
ac induction (ACIM) or permanent magnet synchronous (PMSM) motor
control. In addition, each PWM block contains special functions that con-
siderably simplify the generation of the required PWM switching patterns
for control of the electronically commutated motor (ECM) or brushless dc
motor (BDCM). Software can enable a special mode for switched reluc-
tance motors (SRM).
Features of each 3-phase PWM generation unit are:
• 16-bit center-based PWM generation unit
• Programmable PWM pulse width
• Single/double update modes
• Programmable dead time and switching frequency
• Twos-complement implementation which permits smooth transi-
tion to full ON and full OFF states
• Possibility to synchronize the PWM generation to an external
synchronization
• Special provisions for BDCM operation (crossover and output
enable functions)
• Wide variety of special switched reluctance (SR) operating modes
• Output polarity and clock gating control
• Dedicated asynchronous PWM shutdown signal
ADSP-BF50x Blackfin Processor Hardware Reference
Introduction
1-13