smart metering - power management & power line communications

1 Smart Meter Solutions Confidential Proprietary

Smart MeteringPower Management & Power Line Communications


Power Management Segment of

Smart Meters


Requirements for a Power Block

Smart MetersSmart Meters require a Power Management block which could

provide:

1. Flexible interface to support wide range of Input voltage

ranges

2. Improved efficiency at all load conditions

3. Enhanced Protection against Faults with Low Input Voltage

4. Improved EMI over the entire load

5. Eliminate noise

6. Ability to adjust output current protection based on output

power demand


Solution ??

A pre-regulator - added to a conventional SMPS and is inserted between the

AC supply rectification and the input bulk capacitor

Solution 1!!

107x Family

Solution 2!!

Solution 3!!


Solution 1 : NCP107x Family


Solution 2- NCP125X Family


Solution 3


I/O

Pro

tecti

on

Power AmpVoltage

Protection

Amp

Smart Card Interface

Metering DSP/

Controller

Current Sensor

(Power)

I/O Interface

Current Sensor

(Neutral)

LCDBacklighting

Control Panel

Voltage Sensor

Memory

Infrared Receiver

RF Transceiver

Voltage Regulation

(Linear, Switching)

Smart Electric Meter

1.8 V3.3 V12 V

Display

Breaker

RS-485

L1

Neutral

User Interface

Infrared Remote In

RS-232

GPRS/GSM/CDMA

Card Slot

ResetPower Line Modem

OutputRectification/

Sync Rect

InputBridge

Rectification

Voltage Regulation(Switching)

Transformer

USB

Ethernet

Euridis

M-Bus

L2

L3


Pre-Regulator & Flyback E-meter SMPS

200 V Pre-regulator PWM Flyback

130 kHz

SOT-223

NCP1075

Vac input

12 V VDC output

4 inter-connections


Power Line Communications


What is PLC?? Basics

“Power-line communication (PLC) carries data on a conductor that is also

used simultaneously for AC electric power transmission or electric power

distribution to consumers”

Power Line Communication (PLC) is a communication technology

that sends data over existing power cables


How does PLC work?

• PLC systems operate by adding a modulated carrier signal

to the wiring system (AC or DC)

• Schemes for Modulating the Carrier Signal:

– (S)FSK : (Spread) Frequency Shift Keying

– BPSK : Binary Phase Shift Keying (BPSK)

– OFMD : Orthogonal Frequency Division Multiplexing

Modulated Carrier Signal

Power Line


PLC Categories and Features

• Broadband PLC:

– Appropriate for high-speed broadband network connections such as

to the Internet

– Operates at higher frequencies (1.8–250 MHz)

– High data rates (up to 100s of Mbps) and is used in shorter-range

applications

• Narrowband PLC:

– Useful for applications requiring narrowband control or low-

bandwidth data collection where low cost and high reliability are

essential

– Operates at lower frequencies (3–500 kHz)

– Lower data rates (up to 100s of kbps), and has longer range (up to

several kilometers), which can be extended using repeaters


Solution for Narrowband PLC


AMIS49587 Key Features

Data communication on power line up to 2400 Bauds Complete handling of protocol layers (PHY to MAC)

Compliance to standards IEC61334-5-1 / EN 50065 and specific ERDF requirement

Proven with 175Hz TCFM signaling

Best in Class Analog demodulation chain

Extremely robust transmission (noise immunity and input sensitivity)

PHY dedicated to S-FSK modulation with programmable interval Programmable carriers in range of 9kHz-115kHz, by steps of 10Hz

Programmable frequency spread : typical separation of 10kHz

Extremely robust PLL, Dynamic range: 104 dB

Half duplex asynchronous communication for mains frequency 50Hz => programmable data rate 300/600/1200/2400 bauds

Embedded Support chorus transmission (repetition with credit)

ARM MCU for advanced filtering and MAC implementation

Interfacing to the outside Operates from a single 3,3V power supply

Programmable SCI Baud rate to Application µC 4800/9600/19200/38400 baud


For more detail regarding ON Semiconductor’s

Smart Meter solutions, please contact your

local ON Semiconductor sales representative

or authorized distributor.

For more detail regarding ON Semiconductor’s

Smart Meter solutions, visit us on the web at

www.onsemi.com.

smart metering - power management & power line communications

Technology

reliability of smart

family solution

smart emeters

vac solution

output power demand

power management block

input bulk capacitor

wide input range