參數(shù)資料
型號： 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
文件頁數(shù)： 13/16頁
文件大?。?/td> 441K
代理商： IR21771SPBF
IR22771S/IR21771S
(PbF)
reduced by half allowing zeroes to be put at f
PWM
multiples (i.e. even and odd harmonics cancellation,
no more computational effort needed by the
controller).
13
www.irf.com
For this particular PWM scheme another suitable
solution is driving the IR2x771 with a half frequency
SYNC signal (f
SYNC
=f
PWM
/2).
In this case the cut frequency of the input filter is
Figure 15:
Even harmonic cancellation principle
1.6 Input filter gain setting
G0 and G1 pins are used to change the time
constant of the integrators of the high side input
filter.
To avoid internal saturation of the input filter, G0
and G1 must be connected according to SYNC
frequency as shown in Table 1. A too small time
constant may saturate the internal integrator, while
a large time constant may reduce accuracy.
G0 and G1 do not affect the overall current sensor
gain.
f
PWM
> 16 kHz *
16 / 10 kHz
10 / 6 kHz
< 6 kHz
*
40 kHz
Table 1:
G0, G1 gain settings
G0
V
B
V
S
V
B
V
S
G1
V
B
V
B
V
S
V
S
Triangular
Phase voltage
Current Mean
harmonic
harmonic
Switching level
harmonic
SYNC 1
SYNC 2
instant
instant
Error
Phase current
Fundamental
harmonic
Third
Fundamental
Stage 1 input:
Input signal
components
(1
and 2
harmonic only)
Third
Sampling
Sampling
Stage 1
output
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