參數(shù)資料
型號(hào)： IR21771SPBF
廠商： International Rectifier
英文描述： Phase Current Sensor IC for AC motor control
中文描述： 相電流傳感器IC交流電機(jī)控制
文件頁(yè)數(shù)： 11/16頁(yè)
文件大?。?/td> 441K
代理商： IR21771SPBF
IR22771S/IR21771S
(PbF)
1.5
Filter AC characteristic
IR21771/22771 signal path can be considered as
composed by three stages in series (see Figure 13).
The first two stages perform the filtering action.
Stage 1 (input filter) implements the filtering action
originating the transfer function shown in Figure 14.
The input filter is a self-adaptive reset integrator
which performs an accurate ripple cancellation. This
stage extracts automatically the PWM frequency
from Sync signal and puts transmission zeros at
even harmonics, rejecting the unwanted PWM
noise.
The following timing diagram shows the principle by
which even harmonics are rejected (Figure 12).
11
www.irf.com
1.4
DC transfer functions
The working principle of the device can be easily
explained by Figure 10, in which the main signals
are represented.
Triangular
reference
SYNC
Vin
PO
Figure 10:
Main current sensor signals and
outputs
PWM out (PO pin) gives a duty cycle which is
inversely proportional to the input signal.
Eq. 2 gives the resulting
D
n
of the PWM output (PO
pin):
%
40
%
20
Eq. 2
in
n
V
V
D
=
where
V
in
= V
inp
-V
inm
30%
25%
20%
15%
10%
V
in
PO duty cycle
Figure 11:
PO Duty Cycle (
D
n
)
Figure 12:
Even harmonic cancellation principle
As can be seen from Figure 14, the odd harmonics
are rejected as a first order low pass filter with a
single pole placed in f
PWM
.
The input filter group delay in the pass-band is very
low (see GD on AC electrical characteristics) due to
the beneficial action of the zeroes.
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