IXDN0036 datasheet(27/41 Pages) IXYS

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ATPWMx Demonstrator Software

6-28

ATAVRFBKIT / EVLD001 User Guide

7597A–AVR–02/06

The different states are outlined below:

PFC_OFF

Nothing happen, the exit from this state is requested by the Command Control state

machine in the Main_pwmx_fluo_demo.c file.

INIT_PFC_HAVERSINE_CHECK

Initialize the control values of the PFC.

Then jump to the HAVERSINE_CHECK state.

HAVERSINE_CHECK

Measure the haversine peak voltage during HAVERSINE_MIN_CHECK_TIME.

Then jump to the PFC_HAVERSINE_CHECK state.

PFC_HAVERSINE_CHECK

PFC haversine peak must be betw een H A VERSINE_PEAK_MIN and

HAVERSINE_PEAK_MAX (90VAC and 265VAC).

If the haversine value is OK, set the max pulse width allowed and jump to the

CONFIGURE_PFC_SOFT_START state.

Else go back to INIT_PFC_HAVERSINE_CHECK state.

CONFIGURE_PFC_SOFT_START

Configures the peripherals PSC0 and comparator0 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 PSC0 and jump to PFC_SOFT_START state.

Else immediately jump to the PFC_PROBLEM state.

PFC_SOFT_START

The PFC soft start consists of PFC_MAX_START_SHOTS pulses configured by

PFC_SOFT_START_CONFIGURATION.

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

Else

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.

IXDN0036 датащи(PDF) 27 Page - IXYS Corporation