| 摘要 |
PROBLEM TO BE SOLVED: To provide a small and inexpensive DC power supply unit with little noise and high efficiency as a DC power supply capable of obtaining desired DC voltage with no insulation from AC power supply feeding power to a main circuit. SOLUTION: To supply desired DC voltage to a parallel circuit of a electrolytic capacitor 14 and an auxiliary load 15 through diodes 11, IGBT12 from a single-phase AC power supply, a driving circuit 13 turns on and off the IGBT12 arbitrarily while the voltage which has undergone half-wave rectification through the diode 11 is occuring. |
