EFS

6/14

3

2

1

FLUORESCENT

TUBE

220V / 50HZ

BALLAST

V strike

The mains voltage is applied

Preheating of the tube

Striking of the tube

PREHEAT

EFS STARLIGHT-KIT APPLICATION NOTE

he Starter is a bi-directional switch which performs two functions:

n

the preheat of the tube,

n

the ignition of the tube.

1/ THE AC POWER SWITCH: FUNCTIONAL DESCRIPTION

During the preheat period, the ASD

™ is fully

conducting. The tube lamp is short circuited by the

starter, and the current flows through its filaments.

In these conditions, the lamp can not light up, but

the temperature of the lamp electrodes increases.

At the end of the preheat period, lamp filaments

are warm enough to emit electrons in the gas and

to permit the lamp ignition in good conditions. The

ASD

™ switches off the preheating current . At this

moment, the ballast is equivalent to a current

the ASD

™ switches off, the starter voltage

increases. The amplitude of this high voltage spike

is then clamped by the ASD

the starter and the lamp are in parallel, the striking

pulse is directly applied to the lamp. The

electromagnetic energy of the ballast is then

discharged through the lamp and the ASD

™.

Striking pulse

The AC SWITCH merges an auxiliary power

supply for the driver, a power clamping device

(1350V) and a bi-directional switch with his

execution pilot block.

2/ WHAT’S NEW IN THIS SWITCH?

GND

Vcc

TUBE

Power supply

ON / OFF

DRIVER

NEW EFS ASD