參數(shù)資料
型號(hào)： L8150
廠(chǎng)商： 意法半導(dǎo)體
英文描述： Brushless motor predriver
中文描述： 無(wú)刷電機(jī)預(yù)驅(qū)動(dòng)
文件頁(yè)數(shù)： 22/37頁(yè)
文件大?。?/td> 573K
代理商： L8150
Operating description
L8150
22/37
Figure 12.
Filter Block Diagram
The filter working principle is explained in the previous diagram (
Figure 12
): the main
component of the filter circuit is a 12-bit counter that is reset (to the value 0) whenever the
PosFil signal is equal to the
Pos
one. When the two signals are different (meaning that a
transition is happening), the counter will start counting as long as one of the following
conditions will occur:
Pos
signal is again equal to former
PosFil
: in this case a noise is generating some Hall
comparator commutation,
the counter has reached or overcome the value set by
Filter Length
signal: in this case
the internal Hall signals will be latched into the
PosFil
register; immediately after this
event,
PosFil
will become equal to
Pos
and the counter will be reset.
●
●
At the same time (at the end of the filtering time), a flip-flop detecting the direction is
updated with the right direction information according to the former Hall decoding PosFil and
the new one Pos, immediately before latching it into the register.
12-bit Filter Length
is set to two values according to different possibilities:
maximum filtering time, corresponding to 4096 clock periods (
≈
420us in the typical
case, same used for pre-charge function) when an hall effect commutation is detected
just after a startup signal edge (SD or FS) and before TMAX/6 is elapsed. This filtering
time is also used when the motor accelerate starting from a stopped condition (no hall
effect commutation is detected from FS or SD edge to TMAX/6)
the filter length is a fraction of the elapsed time between two Zero Crossing signal (ZC).
During normal working (in case motor period is shorter than TMAX) it is equivalent to
0.625 electrical degrees.
●
●
A ZC signal is produced every time one of these situations happens:
a falling edge of the FS signal is detected
a rising edge of the HallU signal is detected
any hall effect commutations when the high impedance condition is forced by the IC
and the motor is in free-run condition
●
●
●
>=
1
=
COUNTER
REGISTER
ck
Pos
PosFil
PosFil
Enable
Length
Reset
3
12
12
1 Tclk
12 BIT
POS FIL
Latch
Filter
DELAY
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