STPMC1 datasheet(37/77 Pages) STMICROELECTRONICS

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STPMC1

Theory of operation

Doc ID 15728 Rev 6

37/77

9.14

Negative power accumulation (configuration bit ABS, status

bit

SIGN)

The ABS bits govern energy accumulation in case of negative power; they only affect active

power P and fundamental active power F.

The 3-ph status bit

SIGN depends upon 3-ph cumulative power direction while the phase

status bits

SIGNX depends upon phase X power direction.

Table 22 shows power calculation modes according to ABS

9.15

Phase delay calculation

The STPMC1 allows the calculation of the phase delays between voltages. If the line

frequency fline is 50 Hz, a 120° phase delay corresponds to 6.7 ms.

Table 21.

LED pin configuration for APL = 2, 3

APL (2 bits)

KMOT (2 bits)

LED energy output

Phase

Freq

Active energy wide band P

3-ph

Active energy wide band P

3-ph

C/64

1C/128

2C/32

3C/256

Table 22.

Accumulation mode for negative power

ABS

(2 bits)

Accumulation mode

Power calculation

3-ph

SIGN

MA - MB

3-phase Ferraris mode

PΣ = PR + PS + PT

PΣ < 0 → SIGN = 0

PΣ ≥ 0 → SIGN = 1

PΣ < 0 → MA and MB low

PΣ ≥ 0 → see Figure 12

Absolute accumulation per

phase

PΣ = |PR| + |PS| + |PT|PΣ ≥ 0 → SIGN = 1 PΣ ≥ 0 → see Figure 12

Ferraris mode per phase

if PX < 0 → PX = 0

PΣ = PR + PS + PT

PΣ ≥ 0 → SIGN = 1 PΣ ≥ 0 → see Figure 12

Signed accumulation

PΣ = PR + PS + PT

PΣ < 0 → SIGN = 0

PΣ ≥ 0 → SIGN = 1

PΣ < 0 → see Figure 12

PΣ ≥ 0 → see Figure 12

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