High-voltage pulse generator comprising: - a pulse generator configured for generation of control pulses, - an upper part comprising a number N of upper part modules, each upper part module comprising an upper part transistor with an isolated gate having a gate, a drain and a source, and also a control device of the upper part transistor, the control device of the upper part transistor comprising an upper part pulse transformer connected between the gate and the source of the upper part transistor, and by means of which the control pulses of the pulse generator are coupled to the upper part transistor, the upper part modules being connected in series from a first module to a last module such that the source of an upper part transistor of an upper part module is connected to the drain of an upper part transistor of an adjacent upper part module, the high-voltage pulse generator comprising furthermore - a lower part comprising a number M of lower part modules, each lower part module comprising a lower part transistor with an isolated gate having a gate, a drain and a source, and also a control device of the lower part transistor, the control device of the lower part transistor comprising inverse control means of the lower part transistor and also a lower part pulse transformer by means of which the control pulses of the pulse generator are coupled to inverse control means of the lower part transistor, the lower part modules being connected in series from a first lower part module to a last lower part module such that the source of a lower part transistor of a lower part module is connected to the drain of a lower part transistor of an adjacent lower part module, - a continuous high-voltage source connected between the upper part transistor of the first upper part module and the lower part transistor of the last lower part module, - an output terminal mounted between the upper part and the lower part, connected to the upper part transistor of the last upper part module and to the lower part transistor of the first lower part module, the inverse control means of the lower part transistor of each lower part module comprising: - a second transistor with a source connected to the source of the lower part transistor and a drain connected to the gate of said lower part transistor, - a supply device of the second transistor supplying the drain of said second transistor from the drain of the lower part transistor, and in which the lower part pulse transformer is mounted in parallel with the second transistor by being connected to the gate and to the source of the second transistor. - a pulse generator configured for generation of control pulses, - an upper part comprising a number N of upper part modules, - a lower part comprising a number M of lower part modules, each lower part module comprising a lower part transistor with an isolated gate having a gate, a drain and a source, and also a control device of the lower part transistor, the control device of the lower part transistor comprising inverse control means of the lower part transistor and also a lower part pulse transformer by means of which the control pulses of the pulse generator are coupled to inverse control means of the lower part transistor, the lower part modules being connected in series from a first lower part module to a last lower part module such that the source of a lower part transistor of a lower part module is connected to the drain of a lower part transistor of an adjacent lower part module, - a continuous high-voltage source connected between the upper part transistor of the first upper part module and the lower part transistor of the last lower part module, - an output terminal mounted between the upper part and the lower part, connected to the upper part transistor of the last upper part module and to the lower part transistor of the first lower part module, - a second transistor with a source connected to the source of the lower part transistor and a drain connected to the gate of said lower part transistor, - a supply device of the second transistor supplying the drain of said second transistor from the drain of the lower part transistor,