MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 90

• Manufacturer Part Number: MCP3909RD-3PH1
• Description: REF DESIGN MCP3909 3PH ENGY MTR
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-3PH1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: No
• Utilized Ic / Part: MCP3909, PIC18F2520, PIC18F4550
• Primary Attributes: 3-Ph, 220 VAC, In Case, LCD, USB, GUI
• Secondary Attributes: Opto-Isolated Interface for Safety
• Operating Voltage: 220 V
• Operating Current: 5 A
• Description/function: Energy Meter
• For Use With/related Products: MCP3909
• Lead Free Status / RoHS Status: Not applicable / Not applicable

MCP3909 / dsPIC33F 3-Phase Energy Meter Reference Design
DS51723A-page 90
minimal (<0.01%). When the input frequency deviates from the multiple of cycle
frequencies, the calculation error increases rapidly. As the calculation error is related
to the frequency offset to the multiple of freqency point, the calculation error caused by
frequency offset can be corrected. Figure C-6 is the error analysis after frequency off-
set correction using simple parabolic interpolation. Calcultion errors for all parameters
are shown to be less than 0.015% after the correction.
FIGURE C-5:
Iterations.
FIGURE C-6:
Compensation.
Error Analysis Of Improved Quasi-sync Calculation Using 3
Calculation Error Analysis After The Frequency Offset
© 2009 Microchip Technology Inc.