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18. Temperature & Motor Control Module R764203
FAN
TEC
ON
HEATSINK
OFF
TEC
40
30
DMD
T° SENSOR
TEC: Thermo-Electric Cooler
Image 18-2
DMD temperature control
Each DMD is mounted on a metal stud on which there is a TEC , a heatsink and a fan. An NTC-resistor in a voltage-divider circuit
gives the temperature on the stud.
When this temperature rises above a threshold, the TEC is turned on. This way the heat of the DMD is transferred to the heatsink.
When the temperature on the stud has dropped enough, the TEC is turned off again. An LED reflects the activity of the TEC.
A fan continuously blows air through the heatsink to cool it.
Image 18-3
TEC drive
Lens motorisation
Each motor is driven with a separate power stage, supplied however by a common current limiting circuit. One stage at a time is
selected with the appropriate signal from a multiplexer.
R5976820 SLM R12+ PERFORMER 08/03/2005
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