Lumina Power LDD-100 User manual

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USER MANUAL
LDD-100/150/250-XX-YY
CW Diode Driver Power Supplies
The LDD-100/150/250 family of high power CW diode laser can be configured for
output currents from as low as 10A to output current up to 80A at maximum
power levels from 100W to 250W.
As a laser diode driver, the LDD diode driver acts as a programmable current
source and delivers constant current based on the input program signal,
Iprogram(+), which is normally 0-10V. All units are configured with a maximum
current and maximum voltage capability, depending on the user’s requirements.
LDD power supplies will deliver current, as programmed, into any load, providing
the voltage requirements of that load do not exceed the maximum rated voltage
of the unit. When the required compliance voltage is higher then the maximum
rated output voltage of the unit, the unit will limit output current.
LDD diode drivers utilize a proprietary low loss, high frequency power factor
correction circuit which keeps power factor above 0.98. Power factor corrected
power supplies use up to 30% less input current and meet stringent IEC
harmonic requirements. The output inverter is a state-of-the-art zero voltage
switching (ZVS) inverter which permits very high frequency power conversion
with minimum losses and electromagnetic noise.

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Table of Contents Page
LDD Diode Drivers – Theory of Operation 3
LDD-100/150/250 Specifications 5
LDD-100/150/250 Interface 7
INSTALLATION AND OPERATION 9
Optional RS-232 Protocol 12
Tables and Figures
LDD Laser Diode Power Supply Block Diagram 4
LDD-100/150/250 Outline Drawing 6
LDD-100/150/250 Interface Table 7
LDD-100/150/250 Interface Schematic 8
Input Connections 9
Output Connections 9
Response of output to Enable Signal 10
AC Input Requirements 11

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LDD Diode Drivers - Theory of Operation
(Refer to Figure 1)
LDD laser diode drivers were designed specifically for the OEM high power CW
laser diode systems. OEM power supplies for the laser diode industry have the
following requirements:
•Safe laser diode operation
•Broad range of control of output current
•Safe rise/fall times
•Small size
•Power factor correction to conform with CE requirements
•Low conducted electromagnetic emissions
•Low leakage for medical applications
Referring to the “LDD Laser Diode Power Supply” block diagram, the following is
a brief description of operation.
AC Input Power Circuitry
AC input power is processed through a line filter to reduce the conducted EMI to
an acceptable level. The LDD-100/150/250 line filter has minimum capacitance to
ground to minimize leakage currents. Earth Ground stud is provided near the AC
input terminals and should be connected to the system ground.
Power Factor Correction Boost Inverter
The rectified input power is next applied to power factor boost inverter. This
inverter boosts the input voltage to 400VDC. In the process of boosting the input
AC voltage, the input AC current is adjusted so that is always in phase with the
input AC voltage. Without this power factor correction circuit, the AC input
current would be delivered to the power supply in high amplitude, narrow spikes,
having a high harmonic content. With power factor correction, the non-50/60 Hz
harmonics are reduced to near zero. Since only the fundamental frequency is
now used to deliver power, the efficiency of the power supply is improved
considerably.
One problem with standard input power factor correction circuits is that a high
frequency switching circuit is placed across the line in the input side of the
traditional input capacitor filter. This results in substantial switching noise
conducted to the line. Lumina Power employs a proprietary soft-switching boost
inverter which produces minimum switching noise, reduces switching losses, and
results in a smaller heat sink associated with the power factor circuit.
Zero Voltage Switching (ZVS) Inverter
The ZVS inverter and the output transformer are used to step the 400VDC bus
down to the appropriate output value. The ZVS inverter is the most modern high
frequency/low loss/low noise topology utilized in power electronics today.

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Instead of running the inverter in a traditional PWM mode, the inverter is run in a
phase shift mode. With the appropriate output inductor and the appropriate
capacitance across each switching device, in this case MOSFETS, there are
virtually no switching losses in the inverter. The only losses in the devices are I2R
losses associated with the Drain/Source resistance of the MOSFETS. Therefore,
the ZVS inverter also contributes to reduced losses, reduce EMI noise and a
reduction in overall system heatsink requirements.
Output Circuit
The output filter is a single stage RC filter designed to keep ripple and output
noise very low.
Control Circuit
The control circuit handles all the responsibilities associated with safe operation of
the laser diode. Controlled rise and fall times, as well as tight current regulation,
overvoltage and over power protection are controlled and monitored in the
control circuit.
Auxiliary Power
All internal power supply requirements as well as the external +/-15V
and +5V power supplies are derived from the power factor control
boost inductor. All auxiliary power supplies are regulated by standard
linear regulators
Figure 1
LDD-100/150/250 Block Diagram

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LDD-100/150/250-XX-YY SPECIFICATIONS
XX = Ioutmax YY = Voutmax XX * YY cannot exceed Poutmax
Model Poutmax Ioutmax Input Voltage Size (L x W x H)
LDD-100-XX-YY 100W Can be configured
from 10A to 80A
100-240VAC 6.75" x 3.63" x 3.25"
17.1 x 9.2 x 8.26 cm
LDD-150-XX-YY 150W
LDD-250-XX-YY* 250W
Auxiliary Outputs: +5V @0.25A
+15V @0.25A
-15V @0.25A
Maximum compliance voltage determined by maximum rated power
RS-232 Option available
Other outputs available upon request
Input
Voltage: 100-240VAC, 50/60Hz
Power Factor: >.98
Interface
Connector: 15 Pin “D” Sub Female
Current Program: 0-10V for 0-Max Current
Current Monitor: 0-10V for 0-Max Current
Voltage Monitor: 0-10V for 0-Max Voltage
Performance
Rise/Fall Time: ~600usec (10% to 90% Full Current)
Current Regulation: 0.5% of Maximum output current
Temperature Drift: 0.5% over temperature range after 30 minute warmup (<0.5% in first 30 minutes)
Current Ripple: <0.5% of maximum output current
Current Overshoot: <1% of maximum output current
Power Limit: Limited to maximum power with power fold-back circuit
Environment
Operating Temp: 0 to 40 oC
Storage: -20 to 85
oC
Humidity: 0 to 90% non-condensing
Cooling: Forced air
Regulatory
Leakage Current: <350uA
Approvals:
Medical Safety: LDD-100/150-XX-YY: UL60601-1, UL60950-1:2001, IEC 60601-1, EN 60601-
1, CAN/CSA C22.2 No. 601.1-M90
LDD-250-XX-YY: IEC60950-1:2001 (1st Edition), EN 60950-1,2001,
UL60950-1, CSA22.2 No. 60950-03
Emissions/Immunity: FCC 47 CFR Class A Emissions, EN55011:1998 Group 1 Class A Emissions,
EN61000-3-2 Limits for harmonic current emissions, EN 610000303 Flicker,
EN60601-1-2:2001 Electromagnetic emissions and immunity for medical
equipment
Dimensions: See Figure 2, LDD-100/150/250 Outline Drawing

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Figure 2
LDD-100/150/250 Outline Drawing

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LDD-100/150/250-XX-YY Interface
(Where XX = Ioutmax, and YY = Voutmax)
Connector Type: 15 pin D-sub Female
(Refer to Figure 3, LDD Interface Schematic)
Pin # Pin Name Functional Voltage
Level Description
1 Enable
(input)
High = RUN = +5V to
+15V
Low = OFF = 0V
The Enable function turns the output
section of the power supply ON and
OFF. When the power supply is
enabled, current is delivered to load
as programmed via Iprogram(+),
Pin 7. Rise times resulting from
Enable are approximately 25msec.
2 N/C
3
Interlock
(input) Open = OFF Connect to GND = RUN The Interlock function can be connected to external interlock
switches such as door or overtemp
switches.
4 GND Referred to (-) output of power
supply.
5 Vout Monitor:
(output) 0 – 10V = 0 – Voutmax*
The output voltage of the supply can
be monitored by Vout Monitor.
6 Iout Monitor
(output) 0 – 10V = 0 – Ioutmax The output current of the supply can
be monitored by Iout Monitor.
7 Iprogram(+): (input) 0 – 10V = 0 – Ioutmax The power supply output current is
set by applying a 0-10V analog signal
to Iprogram(+).
8 N/C
9 GND Referred to (-) output of the power
supply.
10,11 +5V @ 0.5A
(output) Auxiliary +5V power supply for user. Up to 0.5A output current capability.
12 -15V @0.5A (output) Auxiliary -15V power supply for user. Up to 0.5A output current available.
13,14 +15V @0.5A
(output) Auxiliary +15V power supply for user. Up to 0.5A output current available.
15 Gnd Referred to (-) output of the power
supply.
TABLE 1: LDD-100/150/250 Interface
* If maximum compliance voltage is less than 10V, Vout Monitor will read output
voltage directly. If maximum compliance voltage is greater than 10V, then Vout Monitor
will be scaled such that 0-10V = 0-Voutmax.

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Figure 3
LDD-100/150/250 Interface

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Installation and Operation of
LDD-100/150/250 Diode Drivers
Figure 4 Figure 5
Input Connections Output Connections
1. CONNECTING TO DIODE LASER Figure 5 shows the location of the LDD-
100/150/250 output terminals. Connect diode laser load to the output terminals.
Consult standard wire gauge tables to ensure proper gauge wire with respect
to maximum output current. Although CW diode laser applications are
generally free of voltage spikes associated with high speed Quasi-CW
applications, it is still good practice to keep connections between the diode laser
and power supply as short as possible to avoid I2R losses in the wire.
2. INTERFACE CONNECTION Connect user system to 15 pin D-sub connector
shown in Figure 4. (Although the user interface is typically designed by the user,
Lumina Power can provide any assistance necessary to modify interface program
and monitor levels) See Table 1 and Figure 3 for description of LDD-100/150/250
Interface and the associated simplified interface schematic.
IMPORTANT INSTALLATION NOTES
•LDD-100/150/250 diode drivers are air cooled by internal fans. Do not
restrict air flow near the input or output air vents of the power supply. If the
unit overheats due to restricted air flow, it will shut down and remain off
until the unit has cooled to a safe operating temperature.
•LDD-100/150/250 units should be mounted in systems using 8-32 (or M4)
bolts to secure the mounting flanges to mounting plate.
SAFETY WARNING
Because LDD-100/150/250 units are designed for OEM applications, the user
must connect AC input power to the power supply. Any input AC voltage
must be considered extremely dangerous and extreme care must be taken to
connect AC input power to the unit.

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3. INTERFACE INFORMATION BEFORE APPLYING AC POWER: The
unit may be programmed for output current via Pin-7, the Iprogram function. But
there are three interface control signals which must be properly set before the
output will deliver current as programmed by Iprogram.
a. INTERLOCK: Pin 3, the Interlock, must be grounded via Pins 4, 9 or 15
in order for the output to deliver current.
b. ENABLE: Pin 1, the ENABLE signal is a 5V to 24V signal used to turn
the output section on. The ENABLE circuitry incorporates a soft start
function which ensures rise times of approximately 15 to 20msec.
Response of Iout to ENABLE signal
c. Iprogram: Pin 7. A 0-10V signal results in 0 to Ioutmax, as long as the
rated compliance voltage of the driver is not exceeded.
4. Operating the LDD
a. AC INPUT POWER CONNECTION Connect AC power connections to
power supply input power terminals as follows (refer to Figure 3.):.
•Neutral wire (16AWG) connected to the right contact of the AC
input terminal (labeled N).
•Line wire (16AWG) connected to the left contact of the AC
terminal block.
•Ground wire shall be crimped to a # 8 ring-lug and connected to the
ground stud.
IMPORTANT NOTE
Make sure when connecting interface that the current program setting,
Iprogram(+), is set no higher then the value required for operation. When AC
power is applied and system is Enabled, output current will rise to this
p
ro
g
ram value
IMPORTANT APPLICATON NOTE REGARDING AC INPUT POWER
AC Input wires should be at least #16 AWG, rated for at least 300V and
105DegC.
CH 1
Iout
20A/div
CH 2
ENABLE

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AC input power requirements for LDD-100/150/250 models are as follows:
Table 2
LDD-100/150/250 AC Input Power Requirements
MODEL INPUT POWER
LDD-100-XX-YY 100-240 VAC, 50/60 Hz, 1.5A @115VAC
LDD-150-XX-YY 100-240 VAC, 50/60 Hz, 2.2A @115VAC
LDD-250-XX-YY 100-240 VAC, 50/60 Hz, 3.6A @220VAC
b. INTERFACE SETTINGS: Make sure INTERLOCK, Pin 3, is
connected to GND.
c. APPLY INPUT AC POWER Turn ON AC power. After a few seconds
the power supply fans should begin to run.
d. PROGRAMMING OUTPUT CURRENT Program LDD-100/150/250
power supply for desired output current. Once the unit has been
ENABLED via Pin 1, a 0-10V signal applied to Iprogram, Pin 7, will
program the LDD-100/150/250 diode driver for 0 to maximum rated output
current.
e. ENABLE OUTPUT Apply +5V to +15V to ENABLE, Pin 1. The LDD-
100/150/250 will deliver output current as programmed.
5. Monitoring LDD output and performance:
a. Current Monitor Power supply output current can be monitored via pin
6, Iout Monitor. A 0-10V signal will represent the output current from 0
to maximum rated output current.
b. Voltage Monitor Power supply output voltage can be monitored via pin
5, Vout Monitor. A 0-10V signal will represent the output voltage from 0-
maximum rated output voltage. If maximum compliance voltage is less
than 10V, Vout Monitor will read output voltage directly. If maximum
compliance voltage is greater than 10V, then Vout Monitor will be scaled
such that 0-10V = 0-Voutmax.
IMPORTANT APPLICATION NOTE
When the power supply is enabled using the ENABLE signal, internal soft
start functions limit the rise time of the output current to approximately
20msec. Once the power supply is enabled, the rise/fall time of the
Iprogram(+) signal is approximately 600usec.
IMPORTANT SYSTEM NOTE ON AC INPUT POWER
LDD-100/150/250 units are fused on both input lines. It does not matter which
of the two AC inputs are designated Line or Neutral.

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Optional RS-232 Protocol
LDD-100/150/250-XX-YY-RS
Refer to Figure 2, LDD-100/150/250 Outline Drawing for location of RS-232 Connector
The RS232 interface for Lumina supplies has the following characteristics:
Baud rate: 9600
Command format: ASCII characters terminated by carriage return
Reply formats: ASCII characters terminated by carriage return
Connection: 9 Pin “D” Female (Tx: Pin 2, Rx: Pin 3, GND: Pin 5)
The interface supports programming the output current and power limit of the supply and
reading back the output current and voltage. The output can be turned on and off with a
command as well.
Command Reply Function
P[email protected]<cr> <cr> Program output current to max rated output current
xx.xx between 0 and 10.00 = 0 – Ioutmax
(Note:Pxx.xx<cr> will also work)
I<cr> xx.xx<cr> Read output current xx.xx between 0 and 10.00 = 0
Ioutmax
V<cr> xx.xx<cr> Read output voltage xx. xx between 0 and 10.00 = 0
toVout
max
ON<cr> <cr> Enable supply output
OFF<cr> <cr> Disable supply output
Jhkhkh<cr> ?<cr> Response to unrecognized command
Numbers sent to the supply should be in fixed point decimal format. The numbers sent
back will have four digits and a decimal point, but the resolution is limited to 12 bits and
the accuracy is limited by the specifications of the supply.

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Connections to Analog Interface when using RS-232
Interlock function, Pin 3, must be employed whether using LDD analog interface or RS-
232. None of the other controls in the Analog interface need be utilized when using the
RS-232 optional interface.
Analog Connector Type: 15 pin D-sub Female
(Refer to Figure 3, LDD Interface Schematic)
Pin # Pin Name Functional Voltage
Level Description
3
Interlock
(input) Open = OFF Connect to GND = RUN The Interlock function can be connected to external interlock
switches such as door or overtemp
switches. Must be used with RS
Interface
Servicing LDD-100/150/250 Diode Drivers
LDD-100/150/250 units have no serviceable parts. Do not attempt to repair or service this
unit in the field. For further information, contact Lumina Power at 978-241-8260.
Lumina Power, Inc.
26 Ward Hill Dr., Bradford, MA 01835
Ph: 978-241-8260 Fx: 978-241-8262
www.luminapower.com
[email protected]