MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 29
MCP3909RD-3PH1
Manufacturer Part Number
MCP3909RD-3PH1
Description
REF DESIGN MCP3909 3PH ENGY MTR
Manufacturer
Microchip Technology
Datasheets
1.MCP3909T-ISS.pdf
(44 pages)
2.MCP3909T-ISS.pdf
(104 pages)
3.MCP3909RD-3PH3.pdf
(88 pages)
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
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3.3
© 2009 Microchip Technology Inc.
CALCULATION() - CALCULATING ELECTRICAL PARAMETERS
All power parameters are calculated with the function Calculation(), which is executed
once every 3 cycles of the power grid. As shown in Figure 3-2, all calculations are
performed post DFT (direct fourier transform), in the frequency domain.
• RMS Voltage/current Of Each phase
• Phase Angle
• Measuring Line Frequency
• Active, Reactive, Apparent Power Of Each Phase
• Positive and Negative Active Power
• Positive/negative Reactive Power
• 4-quadrant Reactive Energy
• Total Active Power, Total Reactive Power, and Total Apparent Power
• Total Power Factor
• Voltage and Current Distortion Of Each Phase
• Voltage and Current Harmonic Contents Of Each Phase
FIGURE 3-2:
Note:
Algorithms for all calculations are shown in Appendix C. “Power
Calculation Theory”.
Calculation() Flow Chart.
phase sequence 1~3
sync. window process
sync. window process
Select sync. window
DTF transformation
DTF transformation
Voltage signal and
Current signal and
Calculate function
Calculate voltage
Calculate voltage
sine/cosine table
function and
RMS value
harmonic
loop
phase sequence 1~3
Calculate frequency,
Calculate combined
and compensation
Combined energy
Update loop array
power calculation
Calculate current
Calculate current
determine phase
pointer and data
End of function
Active/reactive
accumulation
RMS value
calculation
sequence
harmonic
power
length
end
Firmware
DS51723A-page 29
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