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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)： | 21/37頁 |
| 文件大小： | 573K |
| 代理商： | L8150 |
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L8150
Operating description
21/37
2b) The desired direction is not equal to the detected direction so that rectangular mode is
used, the current limiter control method is forcing all the phases in high impedance state.
In any case, current control method is updated every PWM cycle period.
The amplitude of the voltage waveform applied to the motor windings allows the control to
modulate the rotation speed; this is achieved through an 8-bit analog-to-digital converter
(ADC) transforming the output voltage of the control amplifier (INTAMP) into an 8-bit digital
word that is used to scale the voltage waveform applied to the motor windings. A digital
multiplier, whose inputs are the 8-bit samples of the voltage waveform (that is the output of
the 8-bit ADC), gives an 8-bit word that represents the voltage to be applied to the motor
winding.
Furthermore, control signal actuation is performed through a fixed frequency digital PWM
converter, that is converting the 8-bit word coming from the comparator into a digital signal,
whose duty cycle is proportional to the resulting voltage to be applied to the motor windings.
The period of the PWM output signal is:
T
PWM
= 512 Tck
resulting in a frequency that is 19.2 kHz in the typical case.
Motor position is detected through a set of three Hall sensor, whose output is differentially
fed into the device; after processing the signal by means of a comparator (whose
characteristics are explained in the
Electrical Characteristics
section) the signal is
furtherly filtered through a digital circuit to prevent noise from causing any device
malfunctioning.
The filtering circuit processes signals coming from Hall sensors comparators (HallU, HallV,
HallW) and generates a set of three internal signals used inside the digital part of the circuit
(PosFil).
Figure 11.
Filtering circuit
In order to simplify the explanation of the filtering circuit a signal Pos will be defined that can
assume 7 different values according to the following table:
Table 22.
The filtering action takes place according to the following picture (Fig. 7).
7 different values of the signal Pos
HallU
1
1
1
0
0
0
0
HallV
0
0
1
1
1
0
0
HallW
1
0
0
0
1
1
0
Pos
p1
p2
p3
p4
p5
p6
pErr
HallU
HallV
HallW
PosFil
Hall sensor
filtering
block
From input
comparator
To control
logic
3
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