BL0952A/BL6513
Three-
Three-phase Active
Energy Meter
Fig.3 time characteristics of CF, F1 and F2
Parameter
T1
Value
145ms
Description
Pulse-width (Logic High) of F1 or F2. At small load, the pulse-widths of
F1 and F2 are specified as 145ms. When the power is high, the output
periods of F1 and F2 is less than 290ms, and the pulse-widths of F1 and
F2 equal half of the F1 period.
The low output pulse period. (see the formula of operation)
1/2
90ms
t2
Time between F1 Rising Edge and F1 Rising Edge.
CF Pulse-width. At small load, the pulse-width of CF is specified as
90ms. When the power is high, the output period of CF is less than
180ms, and the pulse-width of CF equals half of the CF period.
CF output high frequency. (see the relative between CF and F1, F2)
CLKIN/4
Minimum time between F1 and F2 pulse.
T2
T3
T4
T5
T6
Notes
1) CF is not synchronous to F1 or F2 frequency outputs.
2) Sample tested during initial release and after any redesign or process change that may affect
this parameter.
BASIC THEORY OF OPERATION
ENERGY MEASURE THEORY
In energy measure, the power information varying with time is calculated by a direct
multiplication of the voltage signal and the current signal. Assume that the current signal and the
voltage signal are cosine functions; Umax, Imax are the peak values of the voltage signal and the
current signal;
w
is the angle frequency of the input signals; the phase difference between the
current signal and the voltage signal is expressed as
ϕ
. Then the power is given as follows:
p
(
t
)
=
U
max
cos(
wt
)
×
I
max
cos(
wt
+
ϕ
)
If
ϕ
=
0
:
p
(
t
)
=
U
max
I
max
[1
+
cos(2
wt
)]
2
http://www.belling.com.cn
-6-
Total
6 Pages
4/21/2009
BELLING [ SHANGHAI BELLING CO., LTD. ]
