Importance

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Abstract

An electric fence energizer is operated by an alternating current and has two storage capacitors (C.sub.1, C.sub.2), which are charged by a charging circuit (7) to a high voltage. The storage capacitors (C.sub.1, C.sub.2) are discharged through separate primary windings (L.sub.1, L.sub.2) in a transformer (T) and the secondary winding (L.sub.3) of the transformer is connected to the electric fence. The discharging processes are controlled by separate discharging circuits (R.sub.1, T.sub.y1 ; T.sub.y3 and T.sub.y3 respectively), so that for light loads only one of the storage capacitors (C.sub.1) is discharged, and for heavy loads also the other one (C.sub.2) is discharged starting a short time after the start of the discharging of the first one and during the same discharge cycle. Sense circuits (L.sub.2, R.sub.8, R.sub.9, C.sub.3, R.sub.10, R.sub.11, R.sub.12, T.sub.4, R.sub.13) provide signals PCHL; PPUL) to a microprocessor (7) and they represent the load on the transformer (T). One of the sense circuits (L.sub.2, R.sub.8, R.sub.9, C.sub.3) comprises the second primary winding (L.sub.2) and is used for measuring light loads. It controls, whether the second storage capacitor C.sub.2 is to be charged and can in certain cases control the charge voltage. The second sense circuit (R.sub.10, R.sub.11, R.sub.12, T.sub.4, R.sub.13) is connected to one terminal of the storage capacitors (C.sub.1, C.sub.2) and is used for measuring heavy loads. It controls the time for a start of the discharging of the second storage capacitor and can also in certain cases control the charge voltage. In that way the supplied pulses will have a high voltage and a large energy content and a good safety is achieved.

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