STPM33TR datasheet(44/121 Pages) STMICROELECTRONICS

44 / 121 page

Theory of operation

STPM32, STPM33, STPM34

44/121

DS10272 Rev 8

Figure 34. Fundamental active power and energy calculation block diagram

Results of the calculated quantities are stored in the registers as follows:

EF1 = primary current channel active fundamental energy PH1 Fundamental Energy[31:0]

F1 = primary current channel active fundamental Power PH1 Fundamental Power[28:0]

f1(t) = primary current channel instantaneous active fundamental power PH1 Momentary

Fundamental Power[28:0]

EF2 = secondary current channel active fundamental energy PH2 Fundamental

Energy[31:0]

F2 = secondary current channel active fundamental power PH2 Fundamental Power[28:0]

f2(t) = secondary current channel instantaneous active fundamental power PH2 Momentary

Fundamental Power[28:0]

The fundamental active power measurements have a bandwidth of 80 Hz.

8.4.3

Reactive power and energy calculation

The signal chain for the reactive power, energy calculations and related frequency

conversion are shown in Figure 35. The instantaneous reactive power signal is generated

by multiplying the filtered signals of current and voltage. This value can be compensated by

the reactive power offset calibration block (OFRx[8:0] in DSP_CR10 and DSP_CR12). The

DC component of the instantaneous power signal is extracted from LPF to obtain the

reactive power information.

IIPx

IINx

PLNA

VIPx

VINx

HPF

ROCOIL

INT

BHPFVx

BHPFCx

ROCx

Vx Data [23:0]

Vx[23:0]

Cx [23:0]

bsV

bsC

CHVx [11:0]

CHCx[11:0]

Phase

Compensation

Phase

Compensation

CxData [23:0]

ADC

LPF

Offset

LED

OFAFx[9:0]

PHx Momentary

Fundamental Power[28:0]

PHx Fundamental Power[28:0]

PHxFundamental Energy[31:0 ]

LPF

VxFund[23:0]

Cx Fund[23:0]

GIPG1703140903LM

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