To provide a high efficiency, small and inexpensive DC-DC converter which can reduce a switching loss of a switching element and loss due to recovery current of a diode.
The DC-DC converter 10 comprises a switching element Q1, a choke coil L1, an output capacitor C5, a flywheel diode D3, and an auxiliary transformer T2 having a first winding T2A and a second winding T2B wherein the first winding T2A of the auxiliary transformer T2 has one end connected with the drain of the switching element Q1, and a series circuit is constituted of the first winding T2A and the switching element Q1. Cathode terminal of a diode D2 is connected with one end of the second winding T2B and a series circuit is constituted of the second winding T2B and the diode D2. The other end of the second winding T2B is connected with a DC power supply Vi, and the anode of the diode D2 is connected with the negative electrode side terminal of the DC power supply Vi.
TANAKA MASAHIRO
Miyazaki Yoshio
Mitsuo Tateishi
Kaoru Onozuka
High Masahiro
Toshio Nakamura
Tsutomu Kato
Yusuke Murakoshi
Next Patent: BEARING MECHANISM, MOTOR, AND RECORDING DISC DRIVE