| 摘要 |
<p>A first energy transfer circuit transfers the energy that stores in the transformer while the first switching element is ON, to the output side through an output winding of the transformer during the subsequent OFF period. A second switching element and the output winding of the second energy transfer circuit are connected in a circuit loop that runs through an input terminal, an output terminal, the load, the other output terminal and the other input terminal and transfers energy from the input side to the output side via the output winding when the second switching element is ON. The control circuit controls the ON pulse and the ON timing of the first switching element and the second switching element. A stable output voltage relative to a wide range of input voltages is obtained and, at the same time, a power factor correction is achieved. <MATH></p> |
