MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 25

• 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

2.5
.
FIGURE 2-6:
© 2009 Microchip Technology Inc.
JP4
JP5
JP6
1
1
1
1
N
PC
PB
PA
POWER SUPPLY
1
2
3
4
1
2
3
4
The power supply used in this design provides 3.3V and 5V. Since the energy meter for
a 3-phase 4-wire system is required to operate properly when any one phase is active,
a switching power supply module is used for convenience. T4 is the switching power
supply module.
Prior to the input of this module, additional protection circuitry is included with the meter
design. Figure 2-6 shows the input to the switching power supply module and the
additional filtering and protection circuitry. In Figure 2-6, R
bead, C
to improve anti-surge performance of the system.
Switching Power Supply Module (T4) and Additional Input Protection Circuitry.
R5
COILS
T4
A
B
C
N
N
C
B
A
1
, C
4
, C
Vo2
Vo1
G2
G1
A
B
C
N
6
, RV1, RV2 and RV3 are C
8
7
6
5
8
7
6
5
12V
C1
0.1U
+ C2
100uf
RV1
BB
Hardware Description
capacitors and varistors. They are used
C4
0.1u
JP6
Header 3
1
2
3
RV2
5
is the integrated ferrite
C6
0.1u
DS51723A-page 25
N
RV3
PA
PB
PC
N