參數(shù)資料
型號(hào)： AN2528D
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Standard Space Vector Modulation TPU Function Set (svmStd)
中文描述： 空間矢量調(diào)制標(biāo)準(zhǔn)聚氨酯函數(shù)集（svmStd）
文件頁(yè)數(shù)： 16/28頁(yè)
文件大?。?/td> 514K
代理商： AN2528D
AN2528/D
16
Standard Space Vector Modulation TPU Function Set (svmStd)
For More Information On This Product,
Go to: www.freescale.com
–
In
case two
the MPW is (according to
Figure 8
)
TST +
H
+ TST +
max
(
M
,
L
) + TST+4 + HL
that is 40 +
H
+
max
(
M
,
L
) IMB clock cycles.
MPW
(in IMB clock cycles) = 40 +
H
+
max
(
M
,
L
)
Convert
MPW
in IMB clock cycles to
MPW
in TCR1 clock cycles based
on TCR1 prescaler settings.
When there are no channels of middle or low priority, simply leave out all the
H
or
L
and the following TST or TST+4 from the formulas.
When the recommended configuration rules are not adhered to, the timing of
the worst case is considerably more complicated. It requires some familiarity
with the details of the TPU priority scheme. In this case, the Worst-Case
Latency (WCL), which is automatically calculated by the MPC500_Quick_Start
Graphical Configuration Tool, can serve as a good approximation. This is
always longer than the real-case. Let the WCL be calculated after the
configuration of TPU channels and then find the longest WCL value within all
svmStd PWM channels. Convert the number, from IMB clock cycles to TCR1
clock cycles, to get the
MPW
.
Synchronization
signal for Standard
Space Vector
Modulation
(svmStd_sync)
The svmStd_sync TPU function uses information obtained from svmStd PWM
functions, the actual PWM center times and the PWM periods. This allows a
signal to be generated, which tracks the changes in the PWM period and is
always synchronized with the PWM. The synchronization signal is a positive
pulse generated repeatedly after the
prescaler
or
presc_copy
PWM periods
(see next paragraph). The low to high transition of the pulse can be adjusted
by a parameter, either negative or positive, to go a number of TCR1 TPU cycles
before or after the PWM period center time. The pulse width
pw
is another
synchronization signal parameter.
F
Freescale Semiconductor, Inc.
n
.
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