The use of an electric fence (fence) allows you to graze more animals and to protect gardens and orchards from invasion.
The proposed high voltage pulse generator, circuit diagram of which is shown in the figure, provides pulses with a duration of 0.01 0.015...(60-70 beats per minute) and the voltage with respect to ground 6-7 kV.
Since the output impedance of the generator is large, when touched animal to the fence, the output voltage is reduced from 6-7 to 10-15 kV In that safe for the animal. The structure of the pulse generator includes security alarm. It works in the absence of pulses of high voltage to fences, wire break or fall struts and wires to the earth, falling vegetation on the wire fence. Especially necessary alarm at night time to protect livestock.
The high voltage pulse generator is a low voltage Converter DC voltage in a pulsed high voltage. It contains two series voltage Converter. The first one asymmetrical multivibrator transistors VT1 and VT2. Load transistor VT2 is the primary winding of the boosting transformer T1. With his secondary the winding sequence of short pulses with an amplitude of 150 V is supplied to the second Converter. It is built on a thyristor pulse generator.
Output pulses from the secondary winding of T1 after rectification by the diodes VD2 and VD3 charge storage capacitor C3. When the voltage on C3 reaches voltage enable dynistor VS2 opens VS1, and the capacitor C3 is discharged the primary winding of transformer T2. Bit current pulse through the primary the coil causes the secondary winding of the high voltage pulse. After the end of discharge of the capacitor C3, the thyristor VS1 is closed and the capacitor charging again. The pulse repetition frequency of the multivibrator are dozens kilohertz, and the frequency of the pulses applied to the wire of the fence, from one to a few Hertz. Adjustable pulse frequency multivibrator coming on thyristor pulse generator. This allows to obtain a low-power the generator is powered from a source 12, a powerful high-voltage pulses.
Details. The transformer T1 armour is made on a ferrite core with a diameter of 30 mm, I coil contains 35 turns of PEV-0.45 mm 2, II winding - 800 turns PEL 0,16 mm. Cup of the magnetic circuit with a gap of 0.2 mm using a screw and nut. As the transformer can be used industrial chokes, for example, D30-0.16 and D3 D16...having two windings. Transformer T2 is a line from the TV TSHC or ignition coil from a car. Relay K1 type RES-9 passport RS4.524.203, loudspeaker BA1-5 type HDS-10-8, or any other with the resistance of the voice coil 8 Ohms.
Correctly assembled the generator high-voltage pulses of adjustment is almost not necessary. The action generator check carefully, putting his hand up to the wire connected to terminal X1. When 10 mm spark must jump across with a dry crackling discharge, will be felt a slight tingling. Animals get under stress at a distance of 3-4 mm from the wire. For of an electric fence requires a good grounding that is connected to terminal X3.
Literature
Author: V. F. Yakovlev, Shostka