D-31M
OPERATION MANUAL
Driver for MID-IR LEDs, QCW and Pulse Mode
1. Application
The driver D-31M is designed as power supply of Mid-IR LEDs.
2. Features
•
The driver D-31M provides two modes of operation: Quasi Continuous Wave mode (the mode
of maximum average optical power from the LED) and pulse mode (the mode of maximum
peak optical power from the LED).
The possibility to tune the LED current amplitude, repetition rate and pulse duration, to select
the optimal mode of the LED.
The synchronization capability with a lock-in amplifier or with some other device.
Easy and durable in use.
WARNING!
Do not use multimeter to control the adjust current!
Please, contact your provider regarding these questions.
•
•
•
3. Service Conditions
Temperatur tolerance
Relative air humidity (at temperature + 35°С)
Atmospheric pressure
-15 °С..+50 °С
less then 80 %
86 - 107 kPa
4. Technical Characteristics
Item
Input Voltage
Voltage Tolerance
Power Consumption
Board Dimensions
Weight
Item
Pulse Duration
Repetition Rate (Frequency)
Output Current Amplitude
QCW Mode
31 – 1000 µs
0.5 – 16 kHz
20 – 250 mA
Value
+12 V, stabilized, unipolar
-5 … +5 %
<4 W
90 x 50 x 25 mm
90 g
Pulsed Mode
0.6 – 20 µs
0.5 – 16 kHz
0.1 – 2.0 A
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5. Appearance of the Driver and its Interface
1. The jack for the LED connection.
2. Lookup table of switch position and pulse
duration.
(The table for switch position correlation
with pulse duration)
3. The multiposition switch for adjusting the
pulse duration.
4. The indicators of selected frequency.
5. The button of frequency selection.
6. The jack for the cable of AC/DC adapter.
7. The jack for synchronization cable.
8. The button of mode selection.
9. The start/stop button of LED power
supply.
10. The LED current indicator.
11. The red LED indicator of failure of LED
current.
12. The multiposition switch for adjusting the
LED current.
13. The green LED indicator of pulse mode.
14. The green LED indicator of QCW mode.
15. Lookup table of switch position and LED
current amplitude.
(The table for switch position correlation
with LED current amplitude)
Fig.1.Appearance
of the driver and its interface.
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6. Mode Description
Driver provides two modes of operation: Quasi Continuous Wave (quasi steady-state) mode and
Pulse mode.
6.1. Quasi continuous wave (QCW) mode
The oscillating mode of symmetrical unipolar meander (fig.2.)
Such mode provides maximum average optical power from the LED. The LED current in this mode
can be changed in the range from 20 to 250 mA by using the multiposition switch for adjusting the
LED current (12). Using the button 5 one of four frequencies (512 Hz, 2 kHz, 8 kHz and 16 kHz)
can be selected. The pulse duration will be respectively equal 1000 µs, 250 µs, 62 µs and 31 µs.
Fehler!
f=0,5-16 kHz
31-1000 µs
20-250 mА
31-1000 µs
Fig.2.
Current-time relation in case of continuous wave mode.
6.2. Pulse mode
The oscillating mode of pulse sequence (fig.3)
Such mode provides maximum peak optical power from the LED. Similarly to the quasi continuous
wave mode, by adjusting the switch 12 the LED current can be changed, but in the wider range:
from 0,1 to 2,0 A. Using the button 5 one of four frequencies (512 Hz, 2 kHz, 8 kHz and 16 kHz)
can be selected. Pulse duration can be also selected in the range from 0.6 to 20 µs with the help of
switch 3.
f=0,5-16 kHz
0,6 -20 µs
0-2 А
62-2000 µs
Fig.2.
Current-time relation in case of pulse mode.
Note!
Please, don’t use the combination of frequency and pulse duration that gives a duty cycle
more than 10 percents (table 1).
Note!
We recommend to use the pulse current amount to 2 A only at pulse duration less than 1
µs. Otherwise used LED can be broken.
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Frequency
512 Hz
0,6
0,8
Pulse duration, µs
1
1,2
2
4
8
10
15
20
2 kHz
8 kHz
16 kHz
Table 1.
Permissible
and
impermissible
combinations
of frequency and pulse duration in pulse mode.
7. Operating Instruction
1. Carefully combine the wires of the LED with pins of connector “LED” (1) tightly till fixation.
Note!
Marked with the red point pin of connector “LED” must be connected with the appropriate
wire of the LED (It’s marked with the red point too). In the case of wrong junction the LED
can be damaged.
Fig.4.
Observance of polarity during the connection
between the LED and the LED connector (1).
Note!
LED case must be electrically isolated.
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2. If necessary with the help of cable for synchronization connect the signal detector with the
driver D-31M (jack “SYNCRO” (7)).
Fig.5.
The polarity of jackplug of cable for synchronization.
3. Insert the jackplug of power cable (stabilized, unipolar voltage, 12V) into connector "+12V DC"
(6).
Fig.6.
The polarity of jackplug of power cable.
4. Using the button “Operation mode” (8) select the operating mode of the driver: QCW or pulse.
The appropriate green LED indicator “Pulse” (13) or “QCW” (14) will be turned on.
а
b
c
Fig.7.
a: the button of mode selection, b: QCW mode, с: pulse mode.
5. Set the switch “I
adjust
” (12) to the position “0”, corresponding the minimum value of LED current.
6. Using the button “Freq” (5) select one of four values of frequency. In the case of working in the
pulse mode select the requisite value of pulse duration by adjusting the switch “τ
pulse
” (3) and
using the table 2 on the driver case.
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