Electrical transmission or interconnection systems – Wave form or wave shape determinative or pulse-producing...
Patent
1997-11-10
2000-02-01
Paladini, Albert W.
Electrical transmission or interconnection systems
Wave form or wave shape determinative or pulse-producing...
307108, 256 10, 340564, 361232, H05C 104
Patent
active
060206586
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the field of generation of high-voltage pulses of controlled shape; more particularly to electric fence energisers, and specifically to energisers capable of adapting to a sensed load and optimised in order to operate economically as from batteries.
BACKGROUND
Invention of safe electric fences has permitted farmers over many years to control the movement of livestock around a farm with "variable geometry fencing" which, being light and requiring no great physical strength, can be moved easily, so considerably improving the efficiency of grasslands farming.
While many fences are powered from the mains, it is often an advantage to have a locally driven fence far from a source of mains power. Batteries, windmills, or solar generators are typically used as an energy source, including battery backup in most cases. There is a need for an effective fence energiser that draws a minimal amount of current from a battery supply, in order to conserve consumption and minimise the size of the generator and battery bank used to power the system.
Furthermore, designers of mains-powered energisers have found difficulty in dissipating heat from within a lightly loaded circuit inside a compact enclosure because if the energiser is in a lightly loaded state more of the pulse energy is dissipated within the box. If the circuit can alter its stored charge in accordance with the immediate requirement, it should dissipate a smaller amount of excess energy within its own components, rather than deliver the energy to the fence.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved electric fence energiser, or one which will at least provide the public with a useful choice.
In a board aspect the invention provides a pulse generator in which a series of separated pulses each having a substantially unipolar pulse shape or profile are produced by a process of transferring electrical energy out of storage in a first capacitative storage through an inductor and into a second capacitative storage in parallel with a primary winding of an output transformer to generate transformed pulses at an output connected to a secondary winding. The pulse generator selects one power mode from a selection of power modes, and is capable of altering the power of an output pulse by varying its duration yet retaining the substantially unipolar profile. To this end, the invention includes additional capacitative storage, and an additional indicator which are capable of being included in or excluded from the circuit of the pulse generator.
BRIEF DESCRIPTION OF THE DRAWINGS
The following is a description of a preferred form of the invention, given by way of example only, with reference to the accompanying diagrams.
FIG. 1: is an illustration of a circuit diagram of the control card (carrying a microprocessor) of the preferred embodiment of the invention.
FIG. 2: is an illustration of a circuit diagram of the main module of the preferred embodiment of the invention.
FIG. 3: is an illustration of a circuit diagram of the output pulse strength indicator of the preferred embodiment of the invention.
FIG. 4: is an illustration of a circuit diagram of the control switch array of the preferred embodiment of the invention.
FIG. 5: is an illustration of a circuit diagram of the power indicator of the preferred embodiment of the invention.
FIG. 6: is an illustration of pulse shapes from the energiser of the present invention--in economy mode operation.
FIG. 7: is an illustration of pulse shapes from the energiser of the present invention--in full mode operation.
FIG. 8: is an illustration of pulse shapes from the energiser of the present invention--in automatic mode operation.
FIG. 9: is a diagram of an optically based switch in four operating modes of the invention.
FIG. 10: is a block diagram of the invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
This invention comprises means to generate an electrical impulse of comparatively high power, brief duration, and having a contr
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Boys John Talbot
Green Andrew William
Woodhead Robert Charles Bryan
Paladini Albert W.
Stafix Electric Fencing Ltd.
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