參數(shù)資料
型號(hào)： DRM041
英文描述： Building an USB-DDC ICP Interface Board HardwareReference Design
中文描述： 構(gòu)建的USB接口板DDC的備HardwareReference設(shè)計(jì)
文件頁(yè)數(shù)： 14/80頁(yè)
文件大小： 1025K
代理商： DRM041
Introduction
Designer Reference Manual
DRM040 — Rev 0
14
Introduction
MOTOROLA
Where:
and
By substitution and trigonometric identity the resultant equation can be
derived for instantaneous power:
Instantaneous Power:
The active (real) power is equal to the time integral (continuous
summation of the individual voltage and current product terms) of this
instantaneous power signal and since integration is similar to low-pass
filtering or averaging, the active power can be described by the equation
below, as the average value of the time varying quantity sin(2wt+ ) = 0.
This active power equation is valid for all sinusoidal waveforms.
Active Power:
However, it should be noted that all voltage and especially current
waveforms in practical applications will have some harmonic content.
This active (real) power calculation also holds true for waveforms that
contain harmonics, as explained below:
Using Fourier series expansion, instantaneous voltage and current
waveforms can be expressed as follows:
where:
is the instantaneous voltage
is the average value or DC component
is the rms value of voltage harmonic
h
is the phase angle of the voltage harmonic.
(
t
)
=
V
sin(
ω
t
)
(
t
)
=
I
sin(
ω
t
+θ
)
(
)
)
2
sin(
cos
2
)
(
θ
ω
θ
+
+
×
=
t
I
V
t
p
(
)
θ
cos
2
)
(
I
V
t
p
×
=
v
(
t
)
=
V
o
+
2
×
V
h
×
sin(
h
ω
t
+α
h
)
h
=
1
∞
(
t
)
0
h
α
h
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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