Restoring the performance of LED autolamps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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This article describes an external driver for two LED car lamps that have failed internal drivers.
Commercially available automotive LED lamps (Fig. 1) have a significant drawback - they cannot be used while starting the engine. This is due to the absence of power noise filters inside the lamp, which are recommended by the manufacturer of the PT4115 chip located in the lamp. Voltage surges with an amplitude of up to 30 V that occur during engine start-up disable such microcircuits.
Rice. 1. Automotive LED lamps
In order to restore the operability of the failed lamps, it was necessary to remove the faulty driver boards from them and replace them with "dummy" boards. To do this, the lamps were disassembled from the side of the base and the sealant was removed from them. After that, the lamps were assembled and sealed with Moment glue. Of course, such lamps can no longer be connected directly to the car's on-board network. Therefore, for them it was made according to the scheme shown in Fig. 2, external driver. Thanks to the input filter of chokes L1 and L2 and capacitors C1-C10, it is resistant to interference during start-up and operation of the engine. The dual Schottky diode VD1 protects the driver from applying voltage of the wrong polarity to it.
Rice. 2. External driver circuit (click to enlarge)
The driver is designed to power two LED lamps that do not contain their own drivers. It has two identical pulse step-down voltage converters into a stabilized output current. There are no microcontrollers and specialized microcircuits in the converters.
On the integrated parallel stabilizer DA3, a reference voltage source of 0,22 V is assembled for both converters. It is with this voltage that the converters compare the voltage drop caused by the LED current flowing through the feedback resistors R19, R21 and R20, R22. The ratings of these resistors indicated in the diagram correspond to the output current of each converter 320 mA.
A drawing of the printed circuit board of the driver and the location of parts on it are shown in fig. 3. The board is made of foil fiberglass with a thickness of 1,5...2 mm. Field-effect transistors IRFR5505 and Schottky B560C diodes do not require heat sinks in this case. The two winding choke L1 was removed from the failed monitor, but any similar one will do. Inductor L2 is wound with PEV-2 0,1 wire on a dumbbell-shaped ferrite magnetic circuit with a diameter of 5 ... 6 mm and a length of 10 mm until it is filled. Its inductance is about 15 mH. Inductors L3 and L4 are wound on magnetic cores of the same shape with a diameter of 9 mm and a length of 12 mm with PEV-2 0,5 wire until filling. Their inductance can be in the range from 80 to 150 μH.
Rice. 3. Drawing of the printed circuit board of the driver and the location of parts on it
The board is placed in a ready-made G1022BF case with dimensions of 156x68x44 mm. On fig. 4 shows the appearance of the board in a case with an open cover. The driver is installed in a convenient place under the hood of the car.
Rice. 4. The appearance of the board in a case with an open cover
Establishing the device consists only in setting the required current of the LEDs with a selection of resistors R19-R22.
The PCB file in Sprint Layout 6.0 format can be downloaded from ftp://ftp.radio.ru/pub/2016/01/Leddrv.zip.
Author: S. Chernov
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