10/01/2011, 11:28:14
Le lundi 10 janvier 2011, Frédéric a écrit :
Un autre lien contenant des infos :
http://www.rocketsciencecanada.com/rocke...#dccontrol
En particulier :
"There is a one variation commonly used at variation normal 0-10V control
approach, this is used widely for controlling fluorescent lighting dimming
ballasts. The dimmable fluorescent light ballasts are typically controlled
through 1-10V voltage control system. Many ballasts supply a low voltage
(12-15V typically max) limited current (typically 0.5-0.6 mA) to their
control outputs, so that the dimming can be controlled with just a
potentiometer (1.8 kohm gives around 10V and 200 ohms gives 1 volt to the
ballast).
The definition of 1-10V ballast controlling method is included to IEC 60929
standard. In this system one controller can control up to 50 ballasts.
Active control voltage range is 1-10V (voltages in 0-10V range are
allowed). In this system every ballast is a current source that feeds 0.2-1
mA current to the line (0.3 mA typical). The controller is a current sink
that sinks current so that the voltage on the line drops to ne wanted
control voltage level. The controller current sink must be able to sink up
to 100 mA at 1V output and up to 50 mA at 10V output to be able to control
many ballasts (up to 50). The controller must be able to work with as low
as 0.2 mA current to work reliably with only one ballast connected. The
standard is only designed for lamp dimming level controlling (no special
on/off controlling)."
La technique est donc préférable, puisqu'on peut mixer plusieurs
contrôleurs/ballast, et utiliser aussi bien un contrôleur qui sort du 0-10V
analogique classique que ceux qui font varier une résistance.
Je vais plancher sur le montage, pas si méchant que ça...
PS : au passage, la norme IEC 60929 est celle du protocole DALI, qui coûte
un oeil !!!
--
Frédéric
Un autre lien contenant des infos :
http://www.rocketsciencecanada.com/rocke...#dccontrol
En particulier :
"There is a one variation commonly used at variation normal 0-10V control
approach, this is used widely for controlling fluorescent lighting dimming
ballasts. The dimmable fluorescent light ballasts are typically controlled
through 1-10V voltage control system. Many ballasts supply a low voltage
(12-15V typically max) limited current (typically 0.5-0.6 mA) to their
control outputs, so that the dimming can be controlled with just a
potentiometer (1.8 kohm gives around 10V and 200 ohms gives 1 volt to the
ballast).
The definition of 1-10V ballast controlling method is included to IEC 60929
standard. In this system one controller can control up to 50 ballasts.
Active control voltage range is 1-10V (voltages in 0-10V range are
allowed). In this system every ballast is a current source that feeds 0.2-1
mA current to the line (0.3 mA typical). The controller is a current sink
that sinks current so that the voltage on the line drops to ne wanted
control voltage level. The controller current sink must be able to sink up
to 100 mA at 1V output and up to 50 mA at 10V output to be able to control
many ballasts (up to 50). The controller must be able to work with as low
as 0.2 mA current to work reliably with only one ballast connected. The
standard is only designed for lamp dimming level controlling (no special
on/off controlling)."
La technique est donc préférable, puisqu'on peut mixer plusieurs
contrôleurs/ballast, et utiliser aussi bien un contrôleur qui sort du 0-10V
analogique classique que ceux qui font varier une résistance.
Je vais plancher sur le montage, pas si méchant que ça...
PS : au passage, la norme IEC 60929 est celle du protocole DALI, qui coûte
un oeil !!!
--
Frédéric