Apparatus for generating high pulse voltage comprising: a high DC voltage source (HDCVS); a first capacitor connected by a first plate thereof to a positive terminal of the HDCVS and connected by a second plate thereof to a negative terminal of the HDCVS; a first controllable gate connected by a first terminal thereof to the positive terminal of the HDCVS; an inductive load connected by a first terminal thereof to a second terminal of the first controllable gate; a second controllable gate connected by a first terminal thereof to a second terminal of the inductive load; a limiting resistor connected by one terminal thereof to a second terminal of the second controllable gate and connected by another terminal thereof to the negative terminal of the HDCVS; a low DC voltage source (LDCVS) connected by a negative terminal thereof to the negative terminal of the HDCVS; a square wave generator connected by an output thereof via a buffer matching stage to a control input of the second controllable gate and connected by power inputs (27, 28) thereof to respective terminals (29, 20) of the LDCVS; a first diode; a second capacitor connected by a first plate thereof to a cathode of the first diode and connected by a second plate thereof to the second terminal of the first controllable gate; a second diode connected by a cathode thereof to the first terminal of the inductive load and connected by an anode thereof to the negative terminal of the HDCVS; a third diode connected by an anode thereof to the second terminal of the inductive load and connected by a cathode thereof to the positive terminal of the HDCVS; a controllable switch connected by a first input thereof to the first plate of the second capacitor, connected by a second input thereof to the second plate of the second capacitor, connected by an output thereof to a control input of the first controllable gate, and connected by a control input thereof to the output of the square wave generator, characterized by that the apparatus further comprises a second controllable switch and a square pulse duration converter, whereby the converter is connected by an input thereof to the output of the square wave generator and connected by an output thereof to a control input of the second controllable switch and connected by a first input thereof to the negative terminal of the LDCVS and connected by a second input thereof to the positive terminal of the LDCVS and connected by a second input thereof to the positive terminal of the LDCVS and whereby the second controllable switch is connected by an output thereof to an anode of the first diode. a high DC voltage source (HDCVS); a first capacitor connected by a first plate thereof to a positive terminal of the HDCVS and connected by a second plate thereof to a negative terminal of the HDCVS; a first controllable gate connected by a first terminal thereof to the positive terminal of the HDCVS; an inductive load connected by a first terminal thereof to a second terminal of the first controllable gate; a second controllable gate connected by a first terminal thereof to a second terminal of the inductive load; a limiting resistor connected by one terminal thereof to a second terminal of the second controllable gate and connected by another terminal thereof to the negative terminal of the HDCVS; a low DC voltage source (LDCVS) connected by a negative terminal thereof to the negative terminal of the HDCVS; a square wave generator connected by an output thereof via a buffer matching stage to a control input of the second controllable gate and connected by power inputs (27, 28) thereof to respective terminals (29, 20) of the LDCVS; a first diode; a second capacitor connected by a first plate thereof to a cathode of the first diode and connected by a second plate thereof to the second terminal of the first controllable gate; a second diode connected by a cathode thereof to the first terminal of the inductive load and connected by an anode thereof to the negative terminal of the HDCVS; a third diode connected by an anode thereof to the second terminal of the inductive load and connected by a cathode thereof to the positive terminal of the HDCVS; a controllable switch connected by a first input thereof to the first plate of the second capacitor, connected by a second input thereof to the second plate of the second capacitor, connected by an output thereof to a control input of the first controllable gate, and connected by a control input thereof to the output of the square wave generator, characterized by that the apparatus further comprises a second controllable switch and a square pulse duration converter, whereby the converter is connected by an input thereof to the output of the square wave generator and connected by an output thereof to a control input of the second controllable switch and connected by a first input thereof to the negative terminal of the LDCVS and connected by a second input thereof to the positive terminal of the LDCVS and connected by a second input thereof to the positive terminal of the LDCVS and whereby the second controllable switch is connected by an output thereof to an anode of the first diode.