Thyristor-based car electronic ignition unit
Encyclopedia of radio electronics and electrical engineering /
Automobile. Electronic devices
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The thyristor-based electronic ignition block brought to the attention of readers was developed on the basis of a similar block proposed by E. Zubov (see the article "Simplified ignition system", "Radio", 1968, No. 10, pp. 44-45). To improve efficiency, you
rectifier, a diode bridge was introduced into the new block (Fig. 1), and in order to avoid adjustment in the future, a resistor with a resistance of 3,3 kOhm was included in the control electrode circuit of the thyristor and the ratings of some elements were changed.
During the operation of the ignition unit, the direct current from the vehicle's on-board network is converted into alternating current using a generator assembled on transistors
T1 and T2 and transformer Tp1. At the same time, its voltage rises from 12 to 240 V. After the conversion, the alternating current is again rectified by the diode rectifier D1-D4. The rectified current charges the capacitor C2. Thyristor D6 is closed until a positive pulse is applied to its control electrode. Such a pulse is applied to the thyristor from the capacitor C1 through the diode D5 at the moment of breaking the breaker contacts. The thyristor opens and closes the rectifier bridge and capacitor C2 to the case. Capacitor C2 is discharged through the thyristor and the primary winding of the ignition coil, creating a high voltage pulse in the secondary winding. While the thyristor is open, the converter does not work, and there is no voltage at the output of the bridge. Therefore, as soon as the discharge of capacitor C2 ends, the thyristor is locked. From the same moment, the converter resumes operation, and the block operation cycle is repeated.
If necessary, by simply switching switches B1 and B2, the car can be switched from electronic ignition to conventional.
The design and installation of the block are illustrated in fig. 2. The connections shown in the figure are made with an insulated single-core installation wire, for example,
PMV 0,5. The remaining connections are obtained by desoldering the elements on the printed circuit board. When assembling the block, the mounting plate 2 (Fig. 2,6) is installed to the plate 1 (Fig. 2, c) with the foil side. Pins. 4 (Fig. 2, (3) are inserted with short ends into holes with a diameter of 1,6 mm on the board. The ends of the pins are riveted and soldered. After installing and soldering all the parts, the board is coated on both sides with a transparent zapon varnish (nitroglyptal varnish can also be used).
To the case (drawings are not provided for it), the block is attached at the ends of the plate with six M3 screws. For tightness, the gaps at the passage through the nest plate 2 (Fig. XNUMX, d) are filled with varnish. When installing the unit on a car, the plate must have a reliable electrical connection with the body.
Details. Resistors MLT-1 and MLT-0,25 are used in the ignition unit. Capacitor C1 is BM-1, and C2 is MBGO for 300 V. Diodes D226 can be replaced by D7Zh, diode D9V by any pulsed diode, and transistors P216 by MP4V or MP4G. When replacing, be aware of the installation dimensions, which are determined by the printed circuit board.
The Tpl transformer is made on a core of two ferrite rings K40X 25X7,5 of the 2000 NM brand folded together. Winding I between terminals 1-2 contains 20 turns of PEV wire 0,31; between terminals 2-3-4-90 +90 turns of PEV wire 0,9; 4-5-20 turns of the same wire. Winding II (pins 6-7) has 1800 turns of wire PEV 0,2 or PELSHO 0,2.
The circuit board (Fig. 2,6) is made by a photochemical method. But if only one copy is required, then it is easier to transfer the drawing from fig. 2,6 (grid pitch - 5 mm) and remove blackened areas.
A properly assembled block does not require adjustment, it starts working immediately. When checking the assembled unit, it is necessary to ensure that the spark gap in the boost winding circuit of the ignition coil does not exceed 10 mm, otherwise the insulation in the coil may break through.
Author: A. Blagoveshchensky; Publication: cxem.net
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