shared wiring

The circuit is meant for finishing up hurtless scans with high-voltage pulses and performances in a identical method as an electrified fence generator. The p.r.f. (pulse repetition frequency) is decided by the time constant of community R1-C3 within the feedback loop of op amp IC1a: with values as special, it's about zero.5 Hz. The stage following the op amp, IC1b, converts the oblong signal into slim pulses. Differentiating network R2-C4, together with the switching threshold of the Schmitt set off inputs of IC1b, determines the pulse length, which right here is set 1.5 ms. The output of IC1b is linked in an instant to the gate of thyristor THR1, so that this software is brought about by the pulses.

The requisite excessive voltage is generated with the assist of a small primarys transformer, whose secondary winding is right here used as the important. This winding, at the side of C2, kinds a resonant circuit. Capacitor C3 is charged to the professionalvision voltage (12 V) by means of R3.When a pulse output via IC1b set offs the thyristor, the capacitor is discharged by the use of the secondary winding. The vitality saved within the capacitor is, on the reverse hand, not misplaced, however is saved within the magnetic field professionalduced by means of the transformer when present flows thru it. When the capacitor is discharged, the present stops, whereupon the magnetic container give ways. This induces a counter e.m.f. in the transformer winding which opposes the voltage previous utilized to the transformer.

Simple Electrification Unit Circuit Diagram

This signifies that the direction of the present continues to be the identical. However, capacitor C2 is now charged in the reverse sense, in order that the prospective throughout it is terrible. When the magnetic field of the transformer has again the stored vitality to the capacitor, the course of the present reverses, and the poorly charged capacitor is discharged via D1 and the secondary winding of the transformer. As soon as the capacitor starts to be discharged, there is no present through the thyristor, which due to this fact switches off. When C2 is discharged further, diode D1 is reverse-biased, in order that the present loop to the transformer is damaged, whereupon the capacitor is charged to 12 V once more by the use of R3. At the next pulse from IC1b, this process repeats itself.

Since the transformer after every discharge of the capacitor at its main set offs no longer best a main, but in addition a secondary voltage, every triggering of the thyristor result ins two closely spaced voltage pulses of opposite polarity. These induced voltages at the secondary, that is, the 230 V, winding, of the transformer are, as a effect of the better flips ratio, much larger than those on the major side and may attain a few hundred volts. However, for the explanation that vitality saved in capacitor C2 is fairly small (the present drain is best about 2 mA), the output voltage cannot harm man or animal. It is adequate, then again, to lead to a clearly discernible muscle convulsion.

Author: P. Lay - Copyright: Elektor Electronics