CURRENT SOURCE FOR LED MODULES

Transcription

1 CURRENT SOURCE FOR LED MODULES 100 ma 2000 ma 01/2018 ATEsystem s.r.o. Studentska 6202/ Ostrava-Poruba Czech Republic M E atesystem@atesystem.cz W

2 DOCUMENT INFORMATION Revision number Author Revision date Description 12 Kebo Michal New template document transformation 13 Navratil Josef Snapshots and order numbers update Attachments Notes Contact ATEsystem s.r.o. T Studentska 6202/17 F Ostrava 8 Poruba E atesystem@atesystem.cz Czech Republic W All rights reserved. No part of this document may be published, transported on any medium, copied or translated into foreign languages without previous written approval of ATEsystem s.r.o. ATEsystem s.r.o. does not assume any guarantees for the content of this document and any incidental misprints. Names of products and companies used in this document may be trademarks or registered trademarks of their respective owners. ATEsystem s.r.o ATEsystem s.r.o. Page 2 of 10

3 TABLE OF CONTENTS 1 KEY FEATURES PRODUCT DESCRIPTION MOUNTING AND INSTALLATION TERMINALS AND INDICATORS TYPICAL APPLICATION CHARACTERISTICS DIGITAL INPUTS AND OUTPUTS CHARACTERISTICS PRODUCT OPTIONS ATEsystem s.r.o. Page 3 of 10

4 1 KEY FEATURES Power for single LED or light modules Adjustable current output 100 ma 2000 ma Output voltage up to 50 V DC with 24 V DC power supply LED current measurement LED voltage measurement Binning resistor and NTC measurement Ethernet (802.3) or RS232 interface for PC control - according to ordered option Text (ASCII) communication protocol Autonomous mode of operation controlled just with digital inputs and outputs from PLC Source status signalization with LEDs placed on front panel Fig. 1 Current source Fixed ground (cathode of LEDs) - it is possible to power more LED strings with common cathode individually using several current sources Minimum current ripple which eliminates LED brightness fluctuation during optical test Low current overshoot while shorting LED Overheat protection 2 PRODUCT DESCRIPTION Current source is designed as power supply and test equipment for single LED or strings (modules), which does not contain circuits for current regulation. It is possible to set required current and measure voltage on LED with simple text commands. For both current and voltage there are adjustable limits which prevents of exceeding LEDs maximum ratings. In addition to standard mode with PC communication, current source offers autonomous mode too. Required current and limits are set before testing and stored in memory. Tests are started with digital inputs, current source then evaluate if sample is in range of limits and signalize result (OK/NOK) with digital outputs. For modules containing more LED strings with common ground (cathode) it is possible to use simultaneously several current sources and set their currents individually. For current regulation the anode voltage is changed while cathode stay at the same ground. ATEsystem s.r.o. Page 4 of 10

5 Current source works linear not in switching mode, this is reason of power loss and device may become hot. It has only a passive aluminium heatsink on side, please note this fact during installation to distribution board. Main advantage of linear current source is extremely low ripple of output current, which reduces LEDs brightness fluctuation during optical test. 3 MOUNTING AND INSTALLATION Plastic case contains standardized mount for DIN rail, width of device including heatsink is 61 mm. There must be left free space around heatsink for air circulation, minimal distance of next device is 25 mm. Especially in case of using more current sources in one distribution board power loss and heating must be considered. According to settings and operation mode the power loss could temporary achieve 100 W. The current source must be mounted on the DIN rail always with the red latch downside. Reversed mounting causes additional stress to latch by weight of current source. 4 TERMINALS AND INDICATORS LED State Meaning Green (PWR OK) Red (ERR) Orange (R1) light blinking light blinking light blinking Source is powered on and ready for communication. Output is enabled and source is supplying current according preset parameters. Reading of calibration data failed. Device use default values. Internal temperature exceeds limits or some fault is indicated (For example insufficient internal voltage, self test fail etc.). Output is disabled. If the overheat protection is active, it is necessary to wait and cool the device. Some of measured values (voltage, current) are not in range of limits and output is disabled. Settings must be revised and output enabled again. Output enable is blocked by limits settings. Tab. 1 Description of LED indicators Fig. 2 Front panel - Ethernet option ATEsystem s.r.o. Page 5 of 10

6 Fig. 3 Right side of device Terminal GND VOUT GND VIN Description Common ground input and output ground are internally connected Output voltage LED anode Common ground input and output ground are internally connected Input voltage Tab. 2 Terminal for power supply and output Fig. 4 Left side of device - Ethernet option Terminal Description GND Common ground NTC NTC measurement GND Common ground RBIN Binning resistor measurement GND Common ground DO0 Digital output 0 DO1 Digital output 1 DI0 Digital input 0 DI1 Digital input 1 IO GND Isolated ground for digital inputs and outputs IO PWR Power for digital inputs and outputs Tab. 3 Terminal for resistor measurement and for digital inputs/outputs ATEsystem s.r.o. Page 6 of 10

7 5 TYPICAL APPLICATION Following schematics shows connection of power supply, inputs and outputs. Ethernet connection is not drawn. Fig. 5 Single LED string connection Schematic on Fig. 5 is suitable for any number of LEDs if the sum of all forward voltages does not exceed maximum source output voltage (50 V DC). Fig. 6 Connection of two LED strings with common ground Two and more LED strings with common ground (cathode) must be connected as shown on Fig. 6. For maximum count of LEDs is applied same rule as for single string on Fig. 5. ATEsystem s.r.o. Page 7 of 10

8 Fig. 7 Binning resistor and NTC measurement Fig. 8 Digital input connection Fig. 9 Digital output connection ATEsystem s.r.o. Page 8 of 10

9 6 CHARACTERISTICS Parameter Value* Supply voltage 24 V DC ± 10 % Input power Idle power without load Measured values Output current Output voltage 150 W (depends on output current) 4 W Output current stability ± 1 % Current settings accuracy Current measurement accuracy Output current ripple Current overshoot during load changes (e.g. PWM) output current, LED voltage, NTC, binning resistor 100 ma to 2000 ma 2 V to 50 V DC Output voltage measurement accuracy ± 1,5 % Binning resistor measurement range 100 ma 1500 ma: ± 2,5 % 1500 ma 2000 ma: ± 3,5 % 100 ma 1500 ma: ± 2,0 % 1500 ma 2000 ma: ± 3,0 % < 10 ma peak-peak < 10% (depends on load impedance) 400 Ω - 20 kω Binning resistor measurement accuracy ± 1,5 % NTC measurement range 1 kω - 70 kω NTC measurement accuracy ± 1,5 % Efficiency % Communication interface Communication protocol Output capacitance Current regulation technology Protection Ethernet / RS232 (option) proprietary textual (see communication manual) < 1 nf linear overpower and overheat Mounting DIN rail (EN 60715) Dimensions Power supply and output connection Weight 101 x 120 x 62 mm (without terminal counterparts) screw terminals 450 g Tab. 4 Main characteristics * Relative errors are calculated from the range of measurement (maximum value) of given quantity. ATEsystem s.r.o. Page 9 of 10

10 7 DIGITAL INPUTS AND OUTPUTS CHARACTERISTICS Parameter Recommended DI voltage Max. input voltage on DI DI low level DI high level DI current at 24 V Max. DO switching voltage Max. DO switching current Value 24 V 30 V < 7 V 13 V 24 V 13 ma 30 V DC 200 ma 8 PRODUCT OPTIONS Tab. 5 Digital inputs and outputs characteristics Order number Product code Description PPZPLS00XX Current source for LED modules with Ethernet PPZPLS01XX Current source for LED modules with RS232 Tab. 6 Product options ATEsystem s.r.o. Page 10 of 10