Pulse boost converter for EL. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Pulse boost converter for EL. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters

Comments on the article

A useful distinguishing feature of ELs from incandescent lamps is that the former will work even if the heating filament breaks. The main thing that is necessary to ignite the gas inside the lamp is a relatively high voltage of 300...800 V.

In Fig. 2.10 shows the electrical circuit of a lamp for low-power EL (4-8 W); this is enough for illumination in the car interior and at dusk outdoors. The device works efficiently and is useful wherever there is no mains voltage of 220 V.

Pulse boost converter for EL
Rice. 2.10. Electrical diagram of the converter

The scheme is easy to repeat and contains a minimum of detail.

Principle of operation

The device consists of a rectangular pulse generator implemented on the popular KR1006VI1 timer. The microcircuit is connected according to the standard oscillator circuit; pulse frequency - about 20 kHz.

The output of microcircuit D1 is loaded with a powerful field-effect transistor operating in key mode and a step-up transformer. The transistor opens with each positive edge of the pulses from the output of microcircuit D1. As T1, an industrially manufactured transformer TPP277-127/220-50 is used, connected in reverse. One of the primary windings is the output winding, and one of the secondary windings is connected to the source circuit of the power transistor.

Unregulated use of the transformer is compensated by the high frequency, due to which it is possible to eliminate saturation and heating of T1 during long-term operation.

About details

Instead of the T1 type indicated in the diagram, you can use another one with similar electrical characteristics. The primary winding should have a DC resistance of 110...300 Ohms, and the secondary winding should have a DC resistance of 12...15 Ohms. The winding resistance ratio is 1:20. You can select a transformer for this circuit in a different way.

Among transformers for an operating voltage of 220 V, you need to select the current. which on the secondary step-down winding without load will produce an alternating voltage of 6...8 V.

The current consumed from the battery does not exceed 120 mA. All fixed resistors are MLT-0,5 type.

Capacitor C1 type K50-20; C2, C3 type KM. Capacitor C4 brand KBP-F or K73-11.

Establishment

The circuit does not need to be configured, and if the elements are in working order and installed correctly, the device starts working immediately.

During operation, transformer T1 will emit a quiet whistle and can heat up to a temperature of 50...60°C. Field-effect transistor VT1 should be soldered taking precautions; Soldering each pin takes no more than 2 seconds. The soldering iron must be grounded.

The circuit elements are mounted on a perforated circuit board, which is hidden in a plastic case. The circuit supply voltage (11...14 V) is connected through a connector of type RP10-5.

Authors: Kashkarov A. P., Koldunov A. S.

See other articles Section Voltage converters, rectifiers, inverters.

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