ST7MC2S4-Auto datasheet(188/371 Pages) STMICROELECTRONICS

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Figure 77.

Typical command signals of a three-phase induction motor

These simplified chronograms represent the phase voltages after low-pass filtering of the PWM outputs

reference signals.

10.6.5

Functional description

The MTC can be split into five main parts as shown in the simplified block diagram in

Figure 78. Each of these parts may be configured for different purposes:

●

Input detection block with a comparator, an input multiplexer and an incremental

encoder interface, which may work as:

–

a BEMF zero-crossing detector

–

a speed sensor interface

●

The delay manager with an 8/16-bit timer and an 8x8 bit multiplier, which may work as:

–

an 8-bit delay manager

–

a speed measurement unit

●

The PWM manager, including a measurement window generator, a mode selector and

a current comparator

●

The channel manager with the PWM multiplexer, polarity programming, deadtime

insertion and high frequency chopping capability and emergency HiZ configuration

input

●

The three-phase PWM generator with 12-bit free-running counter and repetition

counter

Phase A (1)

Phase B (1)

Phase C (1)

PWM output

PWM

51% 50% 49%

period

Duty cycle

100%

99%

PWM output

Duty cycle

PWM output

Duty cycle

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