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BL0921 데이터시트 PDF




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부품번호 BL0921 기능
기능 Single Phase Energy Meter IC
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BL0921 데이터시트, 핀배열, 회로
BL0921
Single Phase Energy Meter IC
with Integrated Oscillator
FEATURES
High accuracy, less than 0.1% error over a
dynamic range of 500: 1
On-chip oscillator as clock source
Exactly measure the real power in the positive
orientation and negative orientation, calculate the
energy in the same orientation
Two current monitors continuously monitor the
phase and neutral currents in two-wire distribution
systems. Uses the larger of two currents to bill, even
during a Fault condition
A PGA in the current channel allows using small
value shunt and burden resistance
The low frequency outputs F1 and F2 can
directly drive electromechanical counters and two
phase stepper motors and the high frequency output
CF, supplies instantaneous real power, is intended for
calibration and communications
Two logic outputs REVP and FAULT can be used
to indicate a potential orientation or Fault condition
On-Chip power supply detector
On-Chip anti-creep protection
On-Chip voltage reference of 2.5V±8%
Single 5V supply
Low static power (typical value of 25mW).
The technology of SLiM (Smart–Low–current–
Management) is used.
Credible work, working time is more than twenty
years
Interrelated patents are pending
DESCRIPTION
The BL0921 is a low cost, high accuracy, high
stability, simple peripheral circuit electrical energy
meter IC. The meter based on the BL0921 is intended
for using in single-phase, two-wire distribution
systems. It can exactly measure the real power in the
positive orientation and negative orientation and
calculate the energy in the same orientation.
The BL0921 incorporates a novel fault detection
scheme that both warns of fault conditions and allows
the BL0921 to continue accurate billing during a fault
event. The BL0921 does this by continuously
monitoring both the phase and neutral (return)
currents. PIN12 (FAULT) indicates Fault condition,
when these currents differ by more than 12.5%.
Billing is continued using the larger of the two
currents when the difference is greater than 14%.
The BL0921 supplies average real power
information on the low frequency outputs F1 (Pin16)
and F2 (Pin15). These logic outputs may be used to
directly drive an electromechanical counter and
two-phase stepper motors. The CF (Pin14) logic
output gives instantaneous real power information.
This output is intended to be used for calibration
purposes or interface to an MCU.
BL0921 thinks over the stability of reading
error in the process of calibration. Bulk test data
indicate that in the condition of small signal 5%Ib
(Ib=5A), the error of CF is less than 0.1%. An internal
no-load threshold ensures that the BL0921 does not
exhibit any creep when there is no load.
BLOCK DIAGRAM
VDD 1
16 F1
V1A 2
V1B 3
15 F2
14 CF
V1N 4 BL0921 13 REVP
V2N 5
12 FAULT
V2P 6
11 G
VREF 7
10 S0
GND 8
9 S1
SOP 16
V1A
V1B
V1N
V2P
V2N
VREF VDD
current
sampling
voltage
sampling
voltage
reference
analog
to
digital
analog
to
digital
input contron
internal
oscillator
power
detector
high
pass
filter
high
pass
filter
BL0921
digital
multiplic
ation
low
pass
filter
digital
to
frequency
and
output
FAULT
REVP
CF
F1
F2
logic contron
G S0 S1
http://www.belling.com.cn
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Total 13 Pages
3/15/2007




BL0921 pdf, 반도체, 판매, 대치품
10 Gain Error Match
BL0921
Single Phase Energy Meter IC
with Integrated Oscillator
Pin14
0.2
1
TERMINOLOGY
1) Measurement Error
The error associated with the energy measurement made by the BL0921 is defined by the
following formula:
Pencebtage Error = Energy Re gisteredby the BL0921 True Energy ×100%
True Energy
%
2) Nonlinear Error
The Nonlinear Error is defined by the following formula:
eNL%[(Error at X-Error at Ib) / (1+Error at Ib )]*100%
When V(v)= ±110mV, cosϕ=1, over the arrange of 5%Ib to 800%Ib, the nonlinear error should be
less than 0.1%.
3) Positive And Negative Real Power Error
When the positive real power and the negative real power is equal, and V(v) =±110mV, the test
current is Ib, then the positive and negative real power error can be achieved by the following
formula:
eNP%=|[(eN%-eP%)/(1+eP%)]*100%|
Where: eP% is the Positive Real Power Error, eN% is the Negative Real Power Error.
4) Phase Error Between Channels
The HPF (High Pass Filter) in Channel 1 has a phase lead response. To offset this phase response
and equalize the phase response between channels, a phase correction network is also placed in
Channel 1. The phase correction network matches the phase to within ±0.1°over a range of 45
Hz to 65 Hz and ±0.2°over a range 40Hz to 1KHz.
5) Gain Error
The gain error of the BL0921 is defined as the difference between the measured output frequency
(minus the offset) and the ideal output frequency. It is measured with a gain of 1 in channel V1.
The difference is expressed as a percentage of the ideal frequency. The ideal frequency is obtained
from the BL0921 transfer function.
6) Gain Error Match
The gain error match is defined as the gain error (minus the offset) obtained when switching
between a gain of 1 and a gain of 16. It is expressed as a percentage of the output frequency
obtained under a gain of 1. This gives the gain error observed when the gain selection is changed
from 1 to 16.
7) Power Supply Monitor
BL0921 has the on-chip Power Supply monitoring The BL0921 will remain in a reset
condition until the supply voltage on VDD reaches 4 V. If the supply falls below 4 V, the BL0921
will also be reset and no pulses will be issued on F1, F2 and CF.
http://www.belling.com.cn
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Total 13 Pages
3/15/2007

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BL0921 전자부품, 판매, 대치품
BL0921
Single Phase Energy Meter IC
with Integrated Oscillator
scheme correctly calculates real power for non-sinusoidal current and voltage waveforms at all
power factors. All signal processing is carried out in the digital domain for superior stability over
temperature and time.
I
current
sampling
V
voltage
sampling
V*I
analog to
digital
analog to
digital
high pass
filter
high pass
filter
digital
multipli-
cation
instantaneous
power signal p(t)
p(t)=i(t)*v(t)
low pass
filter
integral
digital to
frequency
instantaneous real
power signal
CF
F1
F2
v(t)=V*cos(wt)
V*I
V*I
i(t)=I*cos(wt)
2
2
p(t)=
V*I
2
[1+cos(2wt)]
t
t
Figure 2. Signal Processing Block Diagram
Accumulating this real power information generates the low frequency output of the BL0921. This
low frequency inherently means a long accumulation time between output pulses. The output
frequency is therefore proportional to the average real power. This average real power information
can, in turn, be accumulated (e.g., by a counter) to generate real energy information. Because of its
high output frequency and hence shorter integration time, the CF output is proportional to the
instantaneous real power. This is useful for system calibration purposes that would take place
under steady load conditions.
Offset Effect
The dc offsets come from the input signals and the forepart analog circuitry.
Assume that the input dc offsets on the voltage channel and the current channel are Uoffset and Ioffset,
and PF equals 1 (φ=0).
p (t ) = [U cos( ω t ) + U offset ] × [ I cos( ω t + Φ ) + I offset ]
= UI
2
+ I offset U
cos(
ωt)
+
U
offset
I
cos(
ωt)
+
UI
2
cos( 2ω t )
Figure 3. Effect of Offset
As can be seen, for each phase input, if there are simultaneous dc offsets on the voltage channel
and the current channel, these offsets contribute a dc component for the result of multiplication.
That is, the offsets bring the error of Uoffset×Ioffset to the final average real power. Additionally,
http://www.belling.com.cn
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Total 13 Pages
3/15/2007

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부품번호상세설명 및 기능제조사
BL0921

Single Phase Energy Meter IC

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