| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC power unit of power factor improvement type having a simple circuit with a small number of parts. SOLUTION: In this DC power unit, a simple control method is taken by providing one input one output. For averaging a peak current flowing in a primary winding relating to a voltage fluctuation in a primary side rectifying circuit, a pulse width is controlled in a switching and switching control circuit 5. For stabilizing output voltage of a DC power output circuit 6, a frequency is controlled in an auxiliary power circuit 2 and an oscillator circuit 3. Simple control thus performed is combined. |
