參數(shù)資料
型號： ST92E141K4D1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 16-BIT, UVPROM, 25 MHz, MICROCONTROLLER, CDIP32
封裝： WINDOWED, SHRINK, CERAMIC, DIP-32
文件頁數(shù)： 25/178頁
文件大?。?/td> 1097K
代理商： ST92E141K4D1
120/178
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 66 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 67 and Figure 68.
Figure 66. Dead Time waveforms
U
Uh
Ul
Delay
5V
0V
9
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