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Part Number: MCP3909RD-3PH1
MCP3909 3-PHASE ENERGY METER REFERENCE DESIGN USING PIC18F2520
- Fully functional 3-phase energy meter using MCP3909 and 7K of PIC18F2520 program memory
- Active Energy Pulse Output, Active Power, Apparent Power, RMS current and RMS voltage calculation
- 62 serially accessible output registers containing power quantities, in Flash
- 54 serially accessible calibration registers, including offset, gain, phase, and LSB correction for all power and energy quantities, in Flash
- Easy to use ‘Store’ command pushes calibration registers to EEPROM for user configurable write cycles
- High accuracy 16-bit ADCs MCP3909, sampled at 128 times per line cycle
- ‘Zero-Blind’ measurements for all power quantities per line cycle
- Phase Lock Loop circuit for line cycle sample lock
- Positive Only Energy accumulation mode
- 64-bit wide active energy register for long term energy accumulation
- Single point phase calibration for CT non-linearity correction
- Multi-point phase correction (coming soon)
- Automatic calibration mode using for high accurate phase locked calibration readings
- Easy to use command driven system
- USB data access for real time display of power measurement, all three phases
- Automated meter calibration using PC software with easy to understand user prompts
- Programmable creep threshold for no-load threshold calibration
- IEC compliant power circuit to ensure meter has power from any single phase
Overview
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The MCP3909 3-Phase Energy Meter Reference Design is a fully functional Flash MCU based 3-phase energy meter. The meter comes populated with components for a 220V, 5(10)A system complete with plastic IEC compliant energy meter case. The case contains high voltage line and load screw terminals for direct connection to mains voltage or to energy meter calibration equipment. The 3-phase energy meter calculations are Flash based using 7K of PIC18F2520 program memory. The calculations include active energy pulse output, active power, apparent power, RMS current, and RMS voltage. There are over 100 serially accessible output registers containing power quantities, in Flash. For calibration, there are registers including offset, gain, phase, and LSB correction for all power and energy quantities, in Flash. All registers are accessible through RS-232 and USB.
The calibration and correction registers can easily be moved from Flash to EEPROM using a simple ‘store’ command for end user configurable write cycle times.
The analog conversion uses the wide dynamic range 16-bit ADCs MCP3909, which are sampled at 128 times per line cycle. The calculations are all interrupt driven to ensure ‘Zero-Blind’ measurements for all power quantities per line cycle.
The system also includes a Phase Lock Loop circuit for line cycle sample lock.
The system is easy to use, command driven, and offers ‘mode’ registers for features such as positive only energy accumulation mode or no-load threshold mode. A 64-bit wide active energy register is used for long term energy accumulation. Phase calibration for CT non-linearity correction is included.
In addition to the power calculation engine using MCP3909 + PIC18F2520, a second communications module is included with the system. The included communications module is the PIC18F4550 USB Interface Module, which allows for meter evaluation and calibration using the “3-Phase Energy Meter Software” running on Windows XP or Windows 2000. The PIC18F4550 USB interface module also includes an LCD for additional energy meter firmware design.
Package Contents
N/A
System Requirements
Supported Operating Systems:
Windows® 2000, Windows® XP
Application Notes
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Date
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Document Category
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| IEC Compliant Active-Energy Meter Design Using the MCP3905A/6A | 01 Jul 2009 | Link | Application Notes |