Patent ID: 8363432

Claim:
A DC-DC converter circuit, comprising: a first switching element; a second switching element; an output transformer comprising a first primary winding connected in series between the positive electrode sides of said first switching element and said second switching element and a second primary winding connected in series between the negative electrode sides of those switching elements, and further comprising a secondary winding for obtaining an output voltage; a rectification diode circuit connected to said secondary winding of said output transformer; a first voltage source, connected between a first connection point at which said first primary winding is connected to said second switching element and said first switching element, and that applies a voltage to said first switching element via said first primary winding; a second voltage source, connected between a second connection point at which said first primary winding is connected to said first switching element and said second switching element, and that applies a voltage to said second switching element via said first primary winding; a control unit that turns said first switching element and said second switching element alternatingly ON and OFF; a first free wheel diode connected in inverse parallel with said first switching element; a first snubber circuit, connected in parallel with said first switching element, and including a series circuit of a first snubber diode and a first snubber capacitor; a first regeneration circuit connected between the positive electrode side of said first voltage source and said first snubber capacitor; said first regeneration circuit comprising a third switching element, a first reactor connected between said third switching element and the positive electrode side of said first voltage source, and a first diode for regeneration connected between said third switching element and said first snubber capacitor; said output transformer comprising a first tertiary winding connected to a control terminal of said third switching element; a second free wheel diode connected in inverse parallel with said second switching element; a second snubber circuit, connected in parallel with said second switching element, and including a series circuit of a second snubber diode and a second snubber capacitor; a second regeneration circuit connected between the positive electrode side of said second voltage source and said second snubber capacitor; said second regeneration circuit comprising a fourth switching element, a second reactor connected between said fourth switching element and the positive electrode side of said second voltage source, and a second diode for regeneration connected between said fourth switching element and said second snubber capacitor; and said output transformer comprising a second tertiary winding connected to a control terminal of said fourth switching element.