BL0952A BELLING [SHANGHAI BELLING CO., LTD.], BL0952A Datasheet - Page 11

• Manufacturer Part Number: BL0952A
• Description: Three-phase Active Energy Meter
• Manufacturer: BELLING [SHANGHAI BELLING CO., LTD.]

By adjusting the external capacitor Cf, the phase error can be corrected. The phase error will affect
the system gain when PF is 0.5, and bring error.
less than
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.
not exceed
frequency and its harmonics. Then the three phase real powers are sent to the adder, and the
arithmetic sum or the absolute value sum (selectable by the pin ADDSEL) can be obtained. The
power sum is passed to the digital-to-frequency converter. In the digital-to-frequency, the power
signal is integrated over time to produce an output frequency. This accumulation of the signal will
suppress any non-dc component in the instantaneous real power signal. Because the average value
of a sinusoidal signal is zero, the frequency generated by the digital-to-frequency is proportional
to the average real power.
instantaneous real power signal over a much shorter time, while converting it to a frequency. Due
to the short accumulating time, there are still ripple in the CF. This will not be a problem in the
application. Where CF is used for calibration purposes, the frequency should be averaged by the
frequency counter. This will remove any ripple. After the output frequency CF, by other
digital-to-frequency converter, the lower output frequency F1 and F2 are obtained. Because the
outputs F1 and F2 operate at a much lower frequency, much more averaging of the instantaneous
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5
%
The process of BL0952A/BL6513/BL6511 can ensure the consistent compensatory value.
Power Supply Monitor
The BL0952A/BL6513/BL6511 contains an on-chip power supply monitor. If the supply is
The trigger level is nominally set at 4V, and the tolerance on this trigger level is about
Digital-To-Frequency Conversion
After multiplication，the low-pass filter is used to attenuate the ac components at the line
Figure 9 shows the calculating process of the output CF:
As can be seen in the diagram, the output frequency CF is generated by accumulating the
. The power supply and decoupling for the part should be such that the ripple at V
4V
5V
5
%
5
%
then the BL0952A/BL6513/BL6511 will go in an inactive state, i.e. no
as specified for normal operation.
Fig.9 Real Power-to-Frequency Conversion
BL0952A/BL6513
BL0952A/BL6513
BL0952A/BL6513
BL0952A/BL6513
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Three
Three- - - - phase Active
Three
Three
Energy Meter
Energy Meter
Energy Meter
Energy Meter
phase Active
phase Active
phase Active
4/21/2009
DD
does