Chokeless power supply for fluorescent lamps. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Chokeless power supply for fluorescent lamps. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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As you know, fluorescent fluorescent lamps are much more economical than incandescent lamps. Their wide introduction for lighting in everyday life and in production could provide significant energy savings. In addition, fluorescent lamps have a much longer service life than incandescent lamps. However, their widespread implementation is hindered by the need for an expensive inductor, and the lamp life is limited by premature burnout of the filaments.

Chokeless power supply for fluorescent lamps

In publications for radio amateurs, circuits for choke-free power supply of fluorescent lamps with doubled and rectified mains voltage have been repeatedly published. The proposed scheme for such a power supply is distinguished by the use of a small incandescent lamp of the "minion" type as a ballast resistance. A schematic diagram of the power supply of a fluorescent lamp is shown in fig. 1. An incandescent lamp is connected in series with a rectifier assembled according to a voltage doubling scheme. Using an incandescent bulb instead of a ballast capacitor or vitrified resistor has a great advantage. The capacitor used in this case has a large capacity and dimensions, and is relatively expensive, since it must be designed for the amplitude value of the mains voltage.

The resistor gets very hot, and in the event of a breakdown of one of the capacitors C1 or C2, it burns out. The incandescent lamp in normal mode burns half-heartedly, and when one of the capacitors breaks down, it lights up with full heat, which indicates a malfunction. The filaments of a fluorescent lamp are not heated, which dramatically increases its service life, and also allows the use of lamps with a burnt filament, which have to be thrown away with a normal power scheme.

To facilitate the ignition of the lamp, an annular foil rim is glued to one end of its cylinder, connected by a conductor to the terminals of the opposite end. The pulsation frequency of the rectified voltage is 100 Hz, which significantly reduces the unpleasant sensation from the flickering of the light flux.

The scheme does not require adjustment. However, it is necessary that the incandescent lamp be included in the phase wire of the network, and not in the zero one. Therefore, in cases where the ignition of a fluorescent lamp is uncertain, you should turn the plug in the power outlet.

The design of the lamp does not cause difficulties. The diodes and capacitors of the rectifier are small and easily placed in the place where the inductor is usually located. The incandescent lamp socket can be installed in the starter hole. The ignition rim is made of foil 50 mm wide and glued to the lamp bulb with BF-2 glue.

According to the same scheme, without changing the ratings of the parts, it is also possible to power the LDC-30 and LDC-20 lamps, while the degree of incandescence of the incandescent lamp will only change.

Publication: cxem.net

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