IXDN0037 datasheet(23/31 Pages) IXYS

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Ballast Demonstrator User Guide

7629A–AVR–04/06

LAMP_NUMBER_CHECK

Check the preheat current in order to know whether there is one or two lamps

Then jump to the START_IGNITION state.

In case there is no lamp, jump to the NO_LAMP state.

START_IGNITION

Decrease the frequency from the init frequency down to

INVERTER_IGNITION_HALF_PERIOD.

Then jump to IGNITION state.

IGNITION

The ignition sequence consists in maintaining the ignition frequency determined by

INVERTER_IGNITION_HALF_PERIOD for 10ms, then checking for ignition by measur-

ing lamp current and voltage.

In case it is... START_RUN_MODE.

In case it isn't... RESTART_PREHEAT.

RESTART_PREHEAT

Reconfigure the Inverter with the Restart parameters, then LAMP_PREHEAT.

If Ignition fails too many times... Go to TOO_MANY_LAMP_IGNITION_TRIES.

START_RUN_MODE

Increase the frequency from the init frequency, INVERTER_IGNITION_HALF_PERIOD.

Then jump to RUN_MODE state.

RUN_MODE

Normal control loop to have the light in accordance with the gv_lamp_preset_current.

TOO_MANY_LAMP_IGNITION_TRIES

If the ignition has failed LAMP_IGNITION_MAX_TRIES, the lamp is switched off.

NO_LAMP

If during the LAMP_NUMBER_CHECK number no lamp is detected, the lamp is

switched Off.

IXDN0037 Datasheet(PDF) 23 Page - IXYS Corporation