Pulse generator for electric fences
First Claim
1. A circuit for an electric pulse generator suitable for use in an electric fence energizer, capable from time to time of generating or constructing one or more substantially unipolar pulses of power having a controlled shape, comprising a control means capable of initiating and controlling the generation of a pulse, a shaping means capable of determining the shape of the pulse when generated at a first low voltage, wherein the amplitude of the pulse has a rising phase in which it rises from a base level up to a peak amplitude gradually at first, then more rapidly, then slows to a rounded peak, then falls in a falling phase which is substantially a mirror image of the rising phase, so that a smooth and substantially symmetrical pulse outline is generated;
- and a pulse transforming means to transform the pulse so generated into a pulse at a second, generally higher voltage without substantial alteration to the shape of the initially generated pulse.
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Accused Products
Abstract
A circuit (700) for an electric fence energizer (examples are 6 or 24 Joule versions) which synthesizes a pulse having a raised cosine waveform at a first or bus voltage uses a ferrite-cored output transformer (701) to multiply the voltage of the pulse to the required level. A raised cosine waveform has a low harmonic content and little filtering of high-power pulses is required in order to minimize electromagnetic emissions. On closure of a switch (707) in series with an inductor (705) a first capacitor bank (703) commences charging a second smaller capacitor bank (704) in parallel with the output primary and after the peak of the pulse any remaining charge is dissipated in a resistor (708) with the aid of a saturable inductor (702), acting as a switch. The saturable inductor may be the output transformer itself for lower output energizers. The output exhibits little or any reversal of polarity when matched to its load. The circuit may also be useful for applications such as strobe flashers in aircraft.
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Citations
11 Claims
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1. A circuit for an electric pulse generator suitable for use in an electric fence energizer, capable from time to time of generating or constructing one or more substantially unipolar pulses of power having a controlled shape, comprising a control means capable of initiating and controlling the generation of a pulse, a shaping means capable of determining the shape of the pulse when generated at a first low voltage, wherein the amplitude of the pulse has a rising phase in which it rises from a base level up to a peak amplitude gradually at first, then more rapidly, then slows to a rounded peak, then falls in a falling phase which is substantially a mirror image of the rising phase, so that a smooth and substantially symmetrical pulse outline is generated;
- and a pulse transforming means to transform the pulse so generated into a pulse at a second, generally higher voltage without substantial alteration to the shape of the initially generated pulse.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification