A high voltage pulse generator for electro-poration comprising: a capacitor bank in which the electric charge used to generate the pulses is stored; the capacitor bank has an output terminal on which a high voltage direct current HT is present; a voltage amplifier circuit which receives, at input, the high voltage direct current HT and is provided with an automatic gain control circuit designed to compare a reference voltage V.sub.HT-ref with the voltage supplied at output V.sub.OUT by the amplifier to maintain the voltage constant at output during generation of the pulses; a current amplifier circuit arranged downstream of the voltage amplifier circuit and provided with an electronic semiconductor switch communicating with a first terminal with the output of the capacitor bank and provided with a second terminal designed to communicate with an output of the pulse generator; the voltage present at the output of the voltage amplifier is supplied to the output of the pulse generator and is used to operate the switching during closing of the electronic semiconductor switch.

A circuit for power transmission through a single conductive element. The circuit includes an oscillator, a single conductive element, and a load. The oscillator is configured to generate a periodic voltage. The single conductive element is connected in series with the oscillator. The load is connected in series with the single conductive element. The load includes a first diode, a first resistor, and a first inductor. The first diode is connected in series with the single conductive element. The first resistor is connected in series with the first diode. The first inductor is connected between the first diode and the single conductive element. The first inductor is connected in series with the first resistor.

A circuit for power transmission through a single conductive element. The circuit includes an oscillator, a single conductive element, and a load. The oscillator is configured to generate a periodic voltage. The single conductive element is connected in series with the oscillator. The load is connected in series with the single conductive element. The load includes a first diode, a first resistor, and a first inductor. The first diode is connected in series with the single conductive element. The first resistor is connected in series with the first diode. The first inductor is connected between the first diode and the single conductive element. The first inductor is connected in series with the first resistor.

A detector measures turn-off voltage change with respect to change in time between a collector and emitter of a transistor and peak voltage of the transistor at the collector. An electronic data processor determines intermediate parameters of turn-off current, the turn-on current and on-state voltage drop based on the turn-off voltage change and the peak voltage. The data processor determines the power or energy loss for one switching cycle of the transistor based on the turn-off current, the turn-on current and on-state voltage drop between the collector and emitter of the transistor. The data processor estimates an associated average die temperature for the transistor over the switching cycle.