MCP39F511N datasheet(25/61 Pages) MICROCHIP

25 / 61 page

 2015-2018 Microchip Technology Inc.

DS20005473B-page 25

MCP39F511N

5.8

Power Factor (PF)

Power factor is calculated by the ratio of P to S, or

Active power divided by Apparent power.

EQUATION 5-6:

POWER FACTOR

The Power Factor Reading is stored in two signed

16-bit registers (Power Factor), one for each channel.

This register is a signed, two's complement register

with the MSB representing the polarity of the power

factor. Positive power factor means import power,

negative power factor means export power. The sign of

the Reactive power component can be used to

determine if the load is inductive (positive) or capacitive

(negative).

Each LSB is then equivalent to a weight of 2-15. A

maximum register value of 0x7FFF corresponds to a

power factor of 1. The minimum register value of

0x8000 corresponds to a power factor of -1.

5.9

Reactive Power (Q)

In the MCP39F511N, Reactive Power is calculated

using a 90 degree phase shift in the voltage channel.

The same accumulation principles apply as with Active

power where ACCU acts as the accumulator. Any light

load or residual power can be removed by using the

Offset Reactive Power register. Gain is corrected by

the Gain Reactive Power register. The final output is an

unsigned 32-bit value located in the Reactive Power

Please note that although this register is unsigned, the

direction of the power can be determined by the

Reactive Power Sign bit in the System Status Register.

FIGURE 5-5:

Channel 1 or Channel 2 Reactive Power Calculation Signal Flow.

---



OffsetReactivePower1,2:s32

ACCU1

ReactivePower1,2:u32

HPF (+90deg.)

GainReactivePower1,2:u16

Range1,2:b32

2N-1

÷ 2N



÷2RANGE

MCP39F511N Datasheet(PDF) 25 Page - Microchip Technology

MCP39F511N Datasheet(HTML) 25 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

Datasheet Download

Link URL