COMBOSOLAR datasheet(45/57 Pages) TI1

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Phase

Neutral

Low-Voltage

Capacitor

High-Voltage

Capacitor

Power

Amplifier

MOV

TVS

Power Supply

AFE031

Phase

Neutral

Low-Voltage

Capacitor

High-Voltage

Capacitor

Power

Amplifier

AFE031

www.ti.com

SBOS531D – AUGUST 2010 – REVISED MAY 2012

LINE-COUPLING CIRCUIT

The line-coupling circuit is one of the most critical circuits in a powerline modem. The line-coupling circuit has

two primary functions: first, to block the low-frequency signal of the mains (commonly 50 Hz or 60 Hz) from

damaging the low-voltage modem circuitry; second, to couple the modem signal to and from the ac mains. A

typical line-coupling circuit is shown in Figure 50.

Figure 50. Simplified Line Coupling Circuit

For additional information on line-coupling interfaces with the AFE031, refer to Application Report SBOA130,

Analog Front-End Design for a Narrowband Power-Line Communications Modem Using the AFE031 (available

for download at www.ti.com).

CIRCUIT PROTECTION

Powerline communications are often located in operating environments that are harsh for electrical components

connected to the ac line. Noise or surges from electrical anomalies such as lightning, capacitor bank switching,

inductive switching, or other grid fault conditions can damage high-performance integrated circuits if they are not

properly protected. The AFE031 can survive even the harshest conditions if several recommendations are

followed.

First, dissipate as much of the electrical disturbance before it reaches the AFE031 with a multi-layer approach

using metal-oxide varistors (MOVs), transient voltage suppression diodes (TVSs), Schottky diodes, and a Zener

diode. Figure 51 shows the recommended strategy for transient overvoltage protection.

Figure 51. Transient Overvoltage Protection for AFE031

Note that the high-voltage coupling capacitor must be able to withstand pulses up to the clamping protection

provided by the MOV. A metalized polypropylene capacitor, such as the 474MKP275KA from Illinois Capacitor,

Inc., is rated for 50 Hz to 60 Hz, 250 VAC to 310 VAC, and can withstand 24 impulses of 2.5 kV.

Product Folder Link(s): AFE031

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