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•
Measurement of the ambient temperature T_AMB and the lamp house temperature NTC_LAMP.
•
Switching on and off of the fans and variation of their speed in function of the measured temperature via the different SHDN_xx
and VDAC_xx connections.
•
Speed control of the FANs around lamp cathode and light engine via FAN_4_CTRL, FAN_2_CTRLand FAN_5_CTRL.
•
Control of some protections, including:
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lamp house fully plugged in via MICR_SW. (Micro switch : switch that senses the position of the lamp house block. It must
be fully pushed in the holes before you can start up.)
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tilt of the projector, (in fact, position of the xenon lamp) via TILT_SW. (Tilt switch : The xenon lamp must be in a well defined
position for maximum lifetime. Because the position of the lamp is determined by the position of the projector a "tilt unit "
mounted on the metal frame below the lamp house is checking the position of the projector. If the projector is installed in
the wrong position, the SMPS cannot start up.
-
absence of mains voltage via V_SIN.
-
T° sensors plugged in ?
•
Adjustment of the voltages for the Peltif the DMD's.
•
Switching on and off of the operational SMPS (+15V).
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Enabling and disabling the protections.
•
Loading the LUT's (conversion of the measured temperature to the speed of the fans).
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Voltages Fan 1,2 & 3 – +30V, +15V, +12V, +5V & +3V3 (multiplexed by I9).
•
Fan speed of Fan 4,5 and 2 (multiplexed by I8)
The lamp temperature related voltage is buffered with I1(3-2-1) , converted in the AD Converter I7 to a digital information and then
further processed using LUT's by theprocessor. In case of a too high temperature the processor switches off the SMPS. In order to
switch off the LPS as well, the ERROR line is pulled low via Q3.
As a safety measure, in the unlikely event the µP fails, the lamp temperature information is applied straight forward to a level detector
I1(5-6-7) . Q2 takes over in this case to pull the ERROR line to an active low state.
Outputs of the local processor:
•
SHDN_0 ... 3 lines : switching on and off the four fan groups.
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SHDN_TEC : switching on and off the SMPS for the Peltier cooling.
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SHDN_SMP : switching on and off the operational SMPS (+15V).
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I²C bus for communication with the main processor (pins 7 -8).
•
local I²C bus for the E²PROM (I5) and AD Converter (I8).
•
data and clock for the local DAC.
The VDAC outputs are controlled by the processor in function of the measured temperature.
The Peltier voltage is programmable. The processor can switch this voltage on and off only. The temperature of the DMD 's is
sensed and the voltage is applied to the TEC's from 40°C onwards. It switches back off at 30°C.
Power Voltage for the Fans
In total 5 adjustable Fan outputs are available:
•
2 Flyback converters (built around T300/I300, and T340/I340) supply each of them a power of minimum 40W by an input voltage
of +380V. The output voltage is adjustable between 12V and 28V. These outputs drive the FAN_LAMP and FAN_MIRR.
•
1 Flyback converter (built around T320/I320) supplies a power of minimum 90W by an input voltage of +380V. The output
voltage is adjustable between 7V and 15V. This output drive the TEC (Thermo electric cooling).
•
3 DC/DC converters (built around I360, I370 and I380) supply each of them a power of approximately 30W by an input voltage
of +30V. The output voltage is adjustable between 12V and 28V. These outputs drive the FAN_1, FAN_2 and FAN_3.
R5976820 SLM R12+ PERFORMER 08/03/2005
17. Switch Mode Power Supply (SMPS) R764349
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