BL6528 Datasheet, PDF (14/27 Pages) SHANGHAI BELLING CO., LTD. – Measure the reactive power transform to fast pulse output

BL6528 Single-phase Multifunction Metering IC
Output
VARGN

Re
Active
Power
 (1
VARGN
2^{12 )}
The minimum value that can be write to the VARGN register is 801H(HEX), which
represents a gain adjustmen of -50%. The maximum value that can be write to the VARGN
register is 7FFH (HEX), which represents a gain adjustmen of +50%.
No-load Threshold of Reactive Power
BL6528 contains two no-load detection features that eliminate meter creep. BL6528 can set
the no-load threshold on the reactive power (VAR_CREEP1), this register is in 12-bit unsigned
magnitude format. This register is used to set the reactive power threshold value, when the
absolute value of the input power signal is less than this threshold, the output reactive power is set
to zero. This can make the reactive power register to 0 in no-load conditions, even a small noise
signal input.
VAR

0
^VAR
,
,
| VAR | VAR _ CREEP1
| VAR | VAR _ CREEP1
The VAR_CREEP2 register is used to set the reactive power timer threshold value. The
default value is 0xFFF. There have a internal TIME_CREEP register in BL6523B, when detect
the CF_VAR pulse output, the TIME_CREEP register is set to the value of VAR_CREEP2. If not
detected the CF_VAR pulse output, the TIME_CREEP register value decrease. If the
TIME_CREEP register decrease to 0, there is still no CF_VAR signal output, the BL6528 produce
a reset signal used to reset the internal energy accumulated register of CF_VAR pulse and reload
the value of VAR_CREEP2 to the TOME_CREEP register. The resolution of the VAR_CREEP2 is
4.6s / LSB, so the maximum timing anti-creep time is about 5h13m.
MODE [3] =1 enable timing anti-creep function.
MODE [3] =0 disable timing anti-creep function.
Reactive power compensation of small signal
BL6528 contains a small reactive power signal compensation register (VAR_LOS), this
register is in 12-bit sign magnitude format. The default value is 000H。
Reactive energy calculation
The relationship between power and energy can be expressed as：
REActive Energy  _ Re active Power(t) dt
In BL6528, the reactive power signals are accumulated in a 53 internal registers continuously
to get reactive energy, Reactive energy register VARHR [23:0] take out this internal register[52:29]
as reactive energy output. This discrete time accumulation is equivalent to integration in
continuous time.
14 / 27
V1.0