Single-Phase Energy Detection Technology Designed by PIC18F87J72

This article describes the main features of the PIC18F87J72, the block diagram, the main features of the PICtailTM Plus daughter board for power detection, and the daughter board circuit diagram. Microchip's PIC18F87J72 is a high-performance MCU with nanoWatt technology with two 24-bit analog front ends (AFEs) and LCD drivers. SINAD is -90dB per channel, -101dBc for THD, 103dB for SFDR, low drift internal reference voltage (12 ppm/°C), programmable data rate to 64ksps, gain up to 32V/V, target for meter, power measurement And surveillance, portable instrumentation and medical surveillance.

PIC18F87J72 target application:

• Energy Metering

• Power Measurement and Monitoring

• Portable InstrumentaTIon

• Medical Monitoring


figure 1. PIC18F87J72 (80-pin) block diagram

PIC18F87J72 Power Detection PICtailTM Plus Daughter Board

The PIC18F87J72 Energy Monitoring PICtailTM Plus Daughter Board is a single phase energy monitor daughter board featuring the PIC18F87J72 high performance 8-bit MCU with 16/24-bit delta-sigma A/D converters. This low cost design uses a shunt for the current The PIC18F87J72 calculates acTIve/reacTIve energy, forward/reverse energy, acTIve/reactive/apparent power and RMS current/voltage. The Energy Monitoring PICtail Plus Daughter Board interfaces to the Explorer 16 Development Board (DM240001) Through additional Explorer can be performed. Through the Explorer 16 Development Board, wired and wireless network connections can be made through other PICtail Daughter boards such as the Ethernet PICtail (AC164123) and the WiFi PICtail (AC164136-4).

This Kit Contains:

One PIC18F87J72 Energy Monitoring PICtailTM Plus Daughter Board


figure 2. PIC18F87J72 Power Detection PICtailTM Plus Daughter Board Outline Drawing

PIC18F87J72 Power Detection PICtailTM Plus Daughter Board Features:

Single phase energy measurement

Energy calculation firmware: Active/Reactive Energy, Forward/Reverse Energy, Active/Reactive/Apparent Power, RMS Current & Voltage

Low cost shunt based design

Better than IEC Class 0.5 performance

Interface to Explorer 16 Development Board


image 3. PIC18F87J72 Power Detection PICtailTM Plus Daughter Board Circuit Diagram (1)

Figure 4. PIC18F87J72 Power Detection PICtailTM Plus Daughter Board Circuit Diagram (2)

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