Voltage converter for LED lamp. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Voltage converter for LED lamp. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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On occasion, I purchased a portable Chinese-made LED flashlight with a battery inside. The flashlight has the ability to switch between a cluster of eight ultra-bright LEDs and a 5,4 V Krypton incandescent lamp. There is also a battery charger inside. In addition, the flashlight is combined with a lamp - a fluorescent lamp with a power of 6 W, powered by a special voltage converter of 150 - 6 V.

Illumination using an energy-saving lamp (hereinafter referred to as EL) of the Osram Dulux S7W type, implemented in this design, is very convenient for many purposes. With it, you can read in a tent, on a camping trip, or in camping conditions continuously for six hours - thanks to the low power consumption of the lamp, provided the built-in battery is fully charged. I tested the lantern and its lamp with an energy-saving lamp “for durability” in rural areas over the course of a year. The circuit design of the voltage converter seems to me to be very successful and valuable for repetition in other designs, and for the use of a ready-made converter board for powering electric power up to 8 W - in an aquarium lamp. The electrical circuit of the converter device is copied from the printed circuit board and shown in the figure.

The principle of operation of the device. The device, implemented using a push-pull pulse voltage converter circuit, operates with a frequency of approximately 112 kHz. The TL494 chip is based on a ready-made pulse-width signal modulator, so the circuit and device as a whole are very simple. At the output of the circuit, high-voltage rectifier diodes are installed to double the converted voltage. The converter uses a ready-made high-frequency transformer brand EL1-ASH from the power supply of an “outdated” Canon BJC-33 printer as T2000. After measuring the resistance of the windings relative to each other, it turned out that their ratio (I to II) is 1:20.

The tap in the primary winding is made exactly from its middle (that is, this winding in this case consists of two halves). Since I have several transformers of the EL33-ASH type from old printer power supplies, I disassembled one of them, and I can state that its secondary winding consists of 220 turns of wire with a diameter of 0,3 mm.

Voltage converter for LED lamp
Torch battery with converter

Fixed resistors R1 and R2 set the pulse width at the output of the converter. The circuit can be simplified (and not use R1, R2), while the 4th pin of DA1 must be connected to the common wire (minus power).

Resistor R3 (together with capacitor C1) sets the operating frequency, which can be adjusted within small limits: as the resistance of resistor R1 decreases, the frequency of the converter generator increases; as the capacitance of capacitor C1 increases, the frequency decreases, and vice versa.

About the details. The TL494 chip can be replaced with a 1114EU4 - this is a complete analogue. Powerful MOSFETs VT1, VT2 are characterized by short switching times and a simple control circuit. They can be replaced with IRFZ46N, IRFZ48N (the larger the number in the marking, the more powerful the analogue is in current).

Voltage converter for LED lamp
The electrical circuit of the voltage converter 150 - 6 V

Instead of HER307 pulse rectifier diodes, HER304 - HER306 or KD213 with any letter index are suitable.

Oxide high-voltage capacitors C3 and C4 with an operating voltage of at least 200 V - type KX, SarHop, HCY CD11GN, ASN-ELB043.

The converter is powered by a portable battery with a voltage of 6 V and a capacity of 1,2 A/h.

Protection of the circuit from overload and reverse power supply (when using the finished board in other designs) can be implemented through a fuse and a diode connected in the forward direction at the input.

Author: A.Kashkarov

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