EVLB001 Datasheet, PDF (21/35 Pages) ATMEL Corporation – Automatic microcontroller dimmable ballast

ATPWMX Demonstrator Software
6.1.2
Control state
machine Global
variables
6.1.2.1
6.1.2.2
Input variables
which have an
impact on the
Control state
machine
Output variables
which can impact
other state
machines
• gv_lamp_on is necessary to determine whether the lamp is already on or not.
• g_too_many_ignition_tries can be set in lamp state machine.
• gv_lamp preset current is set to the wanted value and depending on the
gv_lamp_on and g_too_many_ignition_tries values, gv_lamp_state,
gv_pfc_state and gv_lamp_on can be set to the following values
LAMP_OFF, SHUT_DOWN_PFC_AND_SLOW_DOWN_UC_SPEED, and 0
or 1.
6.2 Pfc_ctrl.c
This file executes the PFC state machine according to the scheduler in the
Main_pwmx_fluo_demo.c file.
6.2.1
PFC STATE
MACHINE
The PFC state machine functional diagram is shown in Figure 6-3.
Figure 6-3. PFC State Machine
The different states are outlined below:
PFC_OFF
Nothing happens, the exit from this state is requested when the gv_lamp_preset_current
variable is modified in control_FBKIT.c file.
INIT_PFC
Nothing happens, the state machine automatically goes to next step
(INIT_PFC_HAVERSINE_CHECK) on the next pfc_task().
INIT_PFC_HAVERSINE_CHECK
Initialize the control values of the PFC.
Then jump to the HAVERSINE_CHECK state.
HAVERSINE_MEASURE
Measure the haversine peak voltage during HAVERSINE_MIN_CHECK_TIME.
Then jump to the HAVERSINE_CHECK state.
6-19
7597B–AVR–10/07
ATAVRFBKIT / EVLB001 User Guide