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PDF BL0921 Data sheet ( Hoja de datos )
| Número de pieza | BL0921 | |
| Descripción | Single Phase Energy Meter IC | |
| Fabricantes | BELLING | |
| Logotipo |  |
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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
1 page  
BL0921
Single Phase Energy Meter IC
with Integrated Oscillator
TIMING CHARACTERISTIC
(VDD=5V, GND=0V, On-Chip Reference, Integrated Oscillator, Temperature range: -20~+70°C)
Parameter Value
Comments
t1 144ms F1 and F2 pulse-width (Logic Low). When the power is low,
the t1 is equal to 144ms; when the power is high, and the
output period falls below 550ms, t1 equals to half of the
output period.
t2 F1 or F2 output pulse period.
t3 ½ t2 Time between F1 falling edge and F2 falling edge.
t4 CF Pulse Period. See Transfer Function section.
t5 71ms CF pulse-width (Logic high). When the power is low, the t5
is equal to 71ms; when the power is high, and the output
period falls below 180ms, t5 equals to half of the output
period.
t6 CLKIN/4 Minimum Time Between F1 and F2.
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.
THEORY OF OPERATION
Principle of Energy Measure
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; V and I are the peak values of the voltage signal and the
current signal; ωis the angle frequency of the input signals; the phase difference between the
current signal and the voltage signal is expressed asФ. Then the power is given as follows:
p(t) = V cos(wt) × I cos(wt + Φ)
http://www.belling.com.cn
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Total 13 Pages
3/15/2007
5 Page 
BL0921
Single Phase Energy Meter IC
with Integrated Oscillator
V1A
V1B
0V
V1A
V1B
V1N
current
sampling
FAULT
to ADC
V1B < 87.5% V1A
Figure 8. Fault Conditions for Inactive Input Less than Active Input
Figure 9 illustrates another fault condition. If V1A is the active input (i.e., is being used for billing)
and the voltage signal on V1B (inactive input) becomes greater than 114% of V1A, the FAULT
indicator goes active, and there is also a swap over to the V1B input. The analog input V1B has
now become the active input. Again there is a time delay of about 1.2 seconds associated with this
swap. V1A will not swap back to being the active channel until V1A becomes greater than 114%
of V1B. However, the FAULT indicator will become inactive as soon as V1A is within 12.5% of
V1B. This threshold eliminates potential chatter between V1A and V1B.
V1B
V1A
V1A
V1B
0V
V1N
current
sampling
FAULT
to ADC
V1A < 87.5% V1B
Figure 9. Fault Conditions for Inactive Input Greater than Active Input
Power Supply Monitor
The BL0921 contains an on-chip power supply monitor. If the supply is less than 4V±5% then
the BL0921 will go in an inactive state, i.e., no energy will be accumulated when the supply
voltage is below 4V. This is useful to ensure correct device operation at power up and during
power down. The power supply monitor has built-in hysteresis and filtering. This gives a high
degree of immunity to false triggering due to noisy supplies.
The trigger level is nominally set at 4V, and the tolerance on this trigger level is about ±5%. The
power supply and decoupling for the part should be such that the ripple at VDD does not exceed
5V±5% as specified for normal operation.
SLiM Technology
The BL0921 adopts the technology of SLiM (Smart Low current Management) to decrease the
static power greatly. The static power of BL0921 is about 15mW. This technology also decreases
the request for power supply design.
BL65XX series products used 0.35um CMOS process. The reliability and consistency are
advanced.
OPERATION MODE
Transfer Function
The BL0921 calculates the product of two voltage signals (on Channel 1 and Channel 2) and then
http://www.belling.com.cn
- 11 -
Total 13 Pages
3/15/2007
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BL0921.PDF ] | |
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