Instrukcja obsługi Microchip PIC32CX1025MTC128
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PIC32CX1025MTC128
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© 2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003460A-page 1
PIC32CXMTx
Microchip PIC32CXMTx Metrology User Guide
Introduction
This document explains how to use the Microchip Metrology library, and it is considered as a complement of the
Microchip Metrology data sheet. It describes the calibration procedure as well as other complex features of the
library, like the waveform capture.
For more detailed information, refer to the full description of the registers of the Microchip Metrology data sheet.
PIC32CXMTx
© 2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003460A-page 2
Table of Contents
Introduction.....................................................................................................................................................1
1. Configuration...........................................................................................................................................3
1.1. Current Conversion Factor........................................................................................................... 3
1.2. Voltage Conversion Factor........................................................................................................... 4
1.3. Swell and Sag.............................................................................................................................. 4
1.4. Pulse Test Constant..................................................................................................................... 4
1.5. CF Pulses.....................................................................................................................................5
1.6. Creep (Start-up/No load).............................................................................................................. 5
1.7. EMAFE......................................................................................................................................... 6
1.8. Other Features............................................................................................................................. 6
2. Calibration............................................................................................................................................... 7
2.1. Magnitude.....................................................................................................................................7
2.2. Phase Delay................................................................................................................................. 8
2.3. Power Offset...............................................................................................................................12
2.4. Conclusions................................................................................................................................13
3. Metrology Firmware Special Function...................................................................................................14
3.1. Waveform Capture..................................................................................................................... 14
3.2. Harmonic Analysis......................................................................................................................15
4. Monitor Metrology Firmware................................................................................................................. 16
5. Revision History.................................................................................................................................... 17
5.1. Rev A - 12/2022......................................................................................................................... 17
Microchip Information................................................................................................................................... 18
The Microchip Website..........................................................................................................................18
Product Change Notification Service.................................................................................................... 18
Customer Support................................................................................................................................. 18
Microchip Devices Code Protection Feature.........................................................................................18
Legal Notice.......................................................................................................................................... 18
Trademarks........................................................................................................................................... 19
Quality Management System................................................................................................................ 20
Worldwide Sales and Service................................................................................................................21
PIC32CXMTx
Configuration
© 2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003460A-page 3
1. Configuration
1.1 Current Conversion Factor
1.1.1 Current Transformer (CT)
K
Ix
=
K
coil
G
PGA
× R
LOAD
Where:
K
coil
is the CT transformer ratio
G
PGA
is the ADC current channel gain
R
LOAD
is the total burden resistance
Example:
If K
coil
= 1000, G
PGA
= 1 and R
LOAD
= 3.24 Ohm, then this is possible:
K
lx
= 1000 / (1 * 3.24) = 308.642
The metrology firmware uses uQ22.10 to represent both integer and fractional numbers; therefore, it is recommended
that this be set:
K_lx = ROUND(308.642 * 2^10) = 0x0004D291
1.1.2 Resistive Shunt
K
Ix
=
1
G
PGA
× R
s untℎ
Example:
If R
shunt
= 100 uOhm = 0.0001 Ohm and G
PGA
= 8, then this is possible:
K
lx
= 1000000 / (8 * 100) = 1250
The metrology firmware uses uQ22.10 to represent both integer and fractional numbers; therefore, it is recommended
that this be set:
K_lx = ROUND(1250 * 2^10) = 0x00138800
1.1.3 Rogowski Coil
K
Ix
=
K
Rogowski
(60 )Hz
G
PGA
Where K
Rogowski
(60 Hz) is Rogowski coil scale factor at 60 Hz.
Note: The scale factor K
Rogowski
is defined at the reference frequency fr = 60 Hz because the DI (Digital Integrator)
filter was designed for unity gain at 60 Hz. If it is desired to use K
Rogowski
defined at another frequency, the gain of the
DI filter must be accounted for in the computation as follows:
K
Ix
=
K
Rogowski
( )f
G
PGA
× _ ( )K di f
Where = 60 Hz/f.K_di(f)
For example, a Rogowski coil is used with an output of 500 uV/A at 60 Hz (or 416.6 uV/A at 50 Hz) and a G
PGA
= 4,
then,
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | Nie skategoryzowane |
| Model: | PIC32CX1025MTC128 |
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