STMicroelectronics STEVAL-GLA001V1, Руководство пользователя

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3.3.3 ON/OFF timer mode
Figure 21. ON/OFF control in timer mode (DC command on the left and pulse command on the right)
Triac push
button
Triac gate
command
V
MAINS
I
T
Current in the Triac
turns off at next
zero current
crossing
Wait for next zero voltage crossing
tp tp
push
Triac push
button
Triac gate
command
V
MAINS
I
T
Current in the Triac
turns off at next
zero current
crossing
Wait for next zero voltage crossing
push
OnTime OnTime
This mode is selected through the MODE switch (refer to Section 3.3.1 Mode selection ). This mode operation is
similar to the ON/OFF basic mode, but a timer stops the AC switch/Load instead of pushing a button.
When you push the AC switch/Load button (Tx) ON, the
NUCLEO-F030R8 development board waits for the next
ZVS, lights ON the corresponding LED (LEDx) and then activates the corresponding AC switch gate (Gx).
The AC switch/load is stopped after the timer (“OnTime” duration) has elapsed: the gate is deactivated and the
LED is switched OFF.
By default, the gate command is a pulsed signal with a duration equal to “tp” value. You can modify this gate ON
duration by pushing on the “TP+” button (to increase ON time) or “TP-” button (to decrease ON time). The gate
command becomes a DC signal when “tp” value has reached the half-period. You can also modify the timer
duration “OnTime” by pushing on the “Power Time +” button (to increase timer duration) or “Power Time -” button
(to decrease timer duration).
All parameters (range, default value, unit, step, etc.) used to configure the load control for this mode are
described in
Section 3.6 User interface . For more details regarding the hardware components used for this mode,
refer to Section 2.5 Hardware function description .
UM2304
Operating mode
UM2304 - Rev 3
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