Abstract: Method for the control of an electric fence energizer of any given power, guaranteeing that, during each pulse emitted by the energizer, any human body that might have come into contact with the electric fence since a recent pulse does not run the risk of receiving a dangerous electric shock by reason of the pulse in progress.

Abstract: Mechanism (8) for adjusting the resistance value of an earth electrode (7) connected to an electrification unit (2) of an electric fence (1), includes a control element (13) for causing the resistance value of the earth electrode to vary.

Abstract: Fence post (1) having a point portion (2) and a principal portion (3). The principal portion is provided with connection elements to assemble a plurality of posts (1, 1?). The connection elements include assembly elements (81, 82) constituted by a female element and a male element. The male element is connected to the principal portion by means of a spacer element (83) connected to the principal portion. The assembly elements permit connecting head to tail two posts to form a pair of posts. The connecting elements also include through holes (71, 72) located on the principal portion. The through holes permit associating on connecting rods several pairs of posts.

Abstract: Several storage condensers (1, 1′, . . . 1″) are mounted in parallel. Several thyristors (2, 2′, . . . 2″) are each mounted in parallel with one condenser (1, 1′, . . . 1″) to ensure the individual discharge of each condenser without modification of the condition of the other condensers. The discharge of the condensers (1, 1′, . . . 1″) is controlled in sequence so as to deliver to the secondary of the transformer a complex pulse comprised by a series of elemental pulses, each elemental pulse corresponding to the individual discharge of one condenser.

Abstract: A control circuit of the current to the secondary and a control circuit of the voltage to the secondary are such that the current for charging the battery and the current for starting will each have a defined maximum value, and such that the voltage at the battery terminals will have a predetermined maximum value.

Abstract: An electrical device for use with a transformer whose primary 2 is supplied under the control of a transistor acting as a high frequency chopper, and from which the secondary delivers a low voltage of continuous shape under control of a first diode 5. In parallel with the primary 2, are arranged a diode 9 and a condenser 10. In parallel with the diode 9 are arranged a resistance 11, a transistor 12 and a diode 13. The leakage inductance energy of the primary 2 is stored in the condenser 10 and recovered in the primary 2 for use in the secondary.