A DC-DC converter intended to convert electrical energy provided by an energy source delivering a first direct voltage and a first direct current having respective first values into output electrical energy at a second direct voltage (V s) and a second direct current (I s) having respective second values, said converter including: - an inverter powered by said energy source and intended to create alternative energy at a third voltage (V e) and with a third current (I e), - a conversion unit (UC a to UC f) intended to deliver said output energy, and - a regulator associated with said conversion unit (UC a to UC f) to regulate said second voltage (V s), - said conversion unit (UC a to UC f) having a transducer (3; 20) powered by said inverter and feeding into a controlled rectifier intended to provide said second voltage (V s), - said controlled rectifier including two serial circuits with opposite conduction directions each made up of a power diode (D 1, D 2) and a saturable induction coil (L sat1, L sat2), said saturable induction coils magnetically controlling, during each cycle of the third voltage (V e) delivered by said inverter, the beginning- and end-of-conduction moments of said power diodes (D 1, D 2), and - said regulator being connected to analyze said second voltage (V s) of said output energy and, as a function of that analysis, to create a control voltage (-V c) intended to regulate said second voltage (V s), - said controlled rectifier also including two regulating diodes (d 1, d 2) connected to inject said control voltage (-V c) respectively into the connection nodes between the power diode (D 1; D 2) and the saturable induction coil (L sat1, L sat2) of said serial circuits of said controlled rectifier, said converter being characterized in that it also includes a reactive serial circuit (L r; 17; L r, C r; L r ', C r '; 25; Lr", C r ") associated with said transducer (3; 20) and cooperating with said controlled rectifier to phase-shift said third voltage (V e) relative to said third current (I e), and in that said control voltage (V c) regulates the phase shift between them as a function of the variations of said second voltage (V s). - an inverter powered by said energy source and intended to create alternative energy at a third voltage (V e) and with a third current (I e), - a conversion unit (UC a to UC f) intended to deliver said output energy, and - a regulator associated with said conversion unit (UC a to UC f) to regulate said second voltage (V s), - said conversion unit (UC a to UC f) having a transducer (3; 20) powered by said inverter and feeding into a controlled rectifier intended to provide said second voltage (V s), - said controlled rectifier including two serial circuits with opposite conduction directions each made up of a power diode (D 1, D 2) and a saturable induction coil (L sat1, L sat2), said saturable induction coils magnetically controlling, during each cycle of the third voltage (V e) delivered by said inverter, the beginning- and end-of-conduction moments of said power diodes (D 1, D 2), and - said regulator being connected to analyze said second voltage (V s) of said output energy and, as a function of that analysis, to create a control voltage (-V c) intended to regulate said second voltage (V s), - said controlled rectifier also including two regulating diodes (d 1, d 2) connected to inject said control voltage (-V c) respectively into the connection nodes between the power diode (D 1; D 2) and the saturable induction coil (L sat1, L sat2) of said serial circuits of said controlled rectifier,