| 摘要 |
PURPOSE: An apparatus for controlling a switching circuit of an electronic equipment is provided to increase an output current by forming a switching circuit unit comprised of plural switching units to operate the switching units according to the variation of magnitude of an input voltage. CONSTITUTION: A voltage detecting unit(110) detects a voltage generated from a voltage generating unit(100) by predetermined periods to output predetermined voltage corresponding to the variation of magnitude of the detected voltage. A switching circuit unit(150) is comprised of a switching unit for switching a transformer. A current detecting unit(160) detects current generated from respective switching units of the switching circuit unit(150) to convert it into voltage. A maximum value selecting unit(170) receives the predetermined voltage converted from the current detecting unit(160) to select voltage having the maximum value. A pulse generating unit(130) receives the output voltage of the current detecting unit(160) to generate a pulse having a predetermined width. When the voltage higher than a reference value is transmitted from the maximum value selecting unit(170), the pulse generating unit(130) discontinues the pulse generation. A driving unit(120) switches the pulse generated from the pulse generating unit(130) according to the input of the voltage of the voltage detecting unit(110) to apply a predetermined signal to the switching circuit unit(150).
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