ST92141 datasheet(120/179 Pages) STMICROELECTRONICS

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ST92141 - 3-PHASE INDUCTION MOTOR CONTROLLER (IMC)

INDUCTION MOTOR CONTROLLER (Cont’d)

Repetition Down-Counter

Both in Zerocentered and Classical working mode,

the four Compare registers (one Compare 0 and

three for the U, V and W phases) are updated

when the PWM counter value is zero and the 8-bit

Repetition Down-Counter has reached zero value

by counting or by software programming (see

PCR2 register).

This means that data transits from the Preload

Compare registers to the Compare registers every

N cycles of the PWM Counter, where N is the val-

ue of the 8-bit Repetition register (N=1, 2, .., 256).

7.4.3.4 Dead Time Generator

For each phase there is one 6-bit Dead Time gen-

erator.

It generates two output signals: h and l.

The h output signal is the same as the input phase

signal except for the rising edge, which is delayed

relatively to the input signal rising edge.

The l output signal is the opposite of the input

phase signal except the rising edge which is de-

layed relatively to the input signal falling edge.

The delay is the same for each phase (U, V, W)

and its value is:

delay = T x N

where T is the period of the Dead Time Generator

input clock (INTCLK divided by 2) and N is the 6-

bit number in the Dead Time register.

If the DTE bit in PCR0 register is reset, the Dead

Time Generator is disabled. This means that no

delays are added to the l complemented outputs.

Figure 67 shows an example waveform of the U

phase.

If the delay is greater than the width of the active

phase (l or h) then the corresponding pulse is not

generated.

See Figure 68 and Figure 69.

Figure 67. Dead Time waveforms

Delay

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