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參數(shù)資料
| 型號： | L8150 |
| 廠商： | 意法半導體 |
| 英文描述： | Brushless motor predriver |
| 中文描述： | 無刷電機預驅(qū)動 |
| 文件頁數(shù)： | 24/37頁 |
| 文件大小： | 573K |
| 代理商： | L8150 |
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Precharge and hall effects filtering time description
L8150
24/37
6
Precharge and hall effects filtering time description
6.1
Startup sequence with FS signal
●
Let’s startup sequence forced by FS comparator, assuming the motor is not rotating:
Figure 14.
Startup sequence forced by FS comparator, assuming the motor is not
rotating
When the signal coming from the FS comparator has a falling edge (corresponding to a Vsp
signal crossing the 1.23V threshold), the logic starts counting, to verify if the motor is
rotating or not. If the motor is stopped and no Hall effect commutation is detected, the
counter has reached its saturation time, given by the following equation:
N.B
. TelMAX is equal to TMAX used in the previous sections of this document.
After this saturation time the logic has decided to do a precharge function, and for a period
of time given by the following equation all the output logic signals UL,VL,WL become high
while the signals UH, VH, WH are low.
When the precharge is over, the logic outputs start applying the right rectangular pattern to
accelerate the motor.
During this sequence the Hall filtering time is 400usec until the first rising edge on signal
HallU is detected. Then a filter given by the following equation is used:
T
ZC is the elapsed time between two consecutive zero-crossing signals. By default a zero-
crossing signal is generated when a falling edge of the FS comparator is detected, and after
that a zero-crossing signal is generated when a rising edge on signal HallU is detected.
FS
PRECHARGE
ZC
HALL BUS
FILTER TIME
PHASES
PHASES EXCITED
400 us
400 us
400 us
T
zc/576
T
zc
Tel
U
TelMax/6
MOTOR ACCELERATING
400 us
400 us
Tel
MAX
7MHz
(
)
1
–
141.5msec
Tel
6
--------------------
24msec
=
T
CHARGE
4096 T
ck
400
μ
sec
=
T
FILTER
576
---------
T
ZC
=
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