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參數(shù)資料
| 型號(hào)： | L8150 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Brushless motor predriver |
| 中文描述： | 無刷電機(jī)預(yù)驅(qū)動(dòng) |
| 文件頁數(shù)： | 25/37頁 |
| 文件大?。?/td> | 573K |
| 代理商： | L8150 |
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L8150
Precharge and hall effects filtering time description
25/37
Assumed this operation mode, it is easy to understand that as soon as the startup sequence
is over, Hall effects commutations are filtered using a fraction of the electrical period given
by the following equation, since T
ZC is equal to TEL when two consecutive zero-crossing
signals generated by a rising edge on signal HallU are detected:
●
Let's consider a startup sequence forced by FS comparator, supposing the motor
rotating quickly in the direction imposed by the FR signal:
Figure 15.
Startup sequence forced by FS comparator, supposing the motor rotating
quickly in the direction imposed by the FR signal:
When the signal coming from the FS comparator has a falling edge, by default a zero-
crossing signal is generated and the logic waits for a Hall effect commutation and applies to
it a filtering time of T
PRECHARGE
=400
μ
sec. The first significant zero-crossing signal is
generated.
Also the second Hall effect commutation is filtered using T
PRECHARGE
, after that the second
zero-crossing signal is generated.
Starting from the second Hall effect commutation, after the acquisition of the filtered Hall
commutation, the logic outputs start applying the right pattern, and the motor is able to
accelerate again.
The next filtering time used for the Hall commutation is a fraction of the elapsed time
between the first two Hall effect commutations, according to the previous T
FILTER
equation.
This filtering time is used until the first rising edge on signal HallU is detected and a zero-
crossing signal is generated. After that the filtering time used is a fraction of the elapsed
time between the last two detected zero-crossing signals, in other words between the
second Hall effect commutation and the rising edge on signal HallU. Finally, when the
second rising edge on signal HallU is detected, the filtering time used is a fraction of the
electrical period, as described in previous T
FILTER-ROTATING
equation.
Let's consider a startup sequence forced by FS comparator, supposing the motor
rotating quickly in the direction opposite to that imposed by the FR signal:
●
T
FILTER
ROATING
–
576
---------
T
ZC
576
---------
T
EL
=
=
FS
ZC
HALL BUS
FILTER TIME
PHASES
PHASES EXCITED
T
zc’’/576
T
zc’
Tel
U
MOTOR ACCELERATING
400 us
T
zc’’
T
zc’/576
T
zc’/576
T
zc’/576
T
zc’’/576
400 us
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