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Ballast Demonstrator User Guide

7629A–AVR–04/06

CONFIGURE_PFC_SOFT_START

Configures the peripherals PWM1 and interrupt 0 to soft start the PFC.

Then jump to START_PFC_SOFT_START.

START_PFC_SOFT_START

Check that the soft start has been tried less than PFC_START_MAX_TRIES

If OK then start PWM1 and jump to PFC_SOFT_START state.

Else immediately jump to PFC_PROBLEM state.

PFC_SOFT_START

The PFC soft start consists on PFC_MAX_START_SHOTS pulses configured on

PFC_SOFT_START_CONFIGURATION.

If a zero crossing detection appears, jump to the PFC_CONTROL_LOOP state

Else go to INIT_PFC_HAVERSINE_CHECK,

PFC_DELAY_FOR_NEXT_PFC_SOFT_START, or PFC_PROBLEM state depending

on the different conditions detailed in the PFC diagram.

PFC_DELAY_FOR_NEXT_PFC_SOFT_START

In case the soft start fails, the software has to wait

DELAY_FOR_NEXT_PFC_SOFT_START*DELAY_MULTIPLIER_FOR_NEXT_PFC_S

OFT_START, before trying a new soft start by going back to the

START_PFC_SOFT_START state.

PFC_CONTROL_LOOP

A zero crossing detection occurs so the PFC is now started and the PFC can be config-

ured on autoretrigg mode.

The PFC is now running. This is the normal PFC loop control.