Patent ID: 8207717
Filing Date: 2012-06-26
Classification: H02M,Y02B

Abstract:
1. A unidirectional DC-DC converter, comprising: a DC power-supply, a buck converter circuit, said buck converter circuit including a first main switching element for intermittently intercepting and connecting a current flowing into a DC load via a main inductor from said DC power-supply, a boost converter circuit, said boost converter circuit including a second main switching element for short-circuiting said DC load, and intermittently intercepting and connecting a current in a circuit for accumulating energy into said main inductor from said DC power-supply, first snubber capacitor connected in parallel to said first and second main switching element, first inversely-parallel diode connected in inversely parallel to said second main switching element, a control device for turning ON/OFF said second main switching element, and controlling duties of said main switching element, and an output diode for releasing said energy onto said load side by said ON/OFF operation of said first and second main switching elements, said energy being accumulated into said main inductor, said unidirectional DC-DC converter further comprising: first and second auxiliary inductors which are coupled to said main inductor magnetically, a drive circuit for detecting generation voltage of first auxiliary inductor for controlling ON/OFF said first switching element, and a first auxiliary switching element for flowing forward direction current into said first inversely parallel diode during a short time-period including a point-in-time for turning ON said second main switching element, utilizing energy stored in said second auxiliary inductor.