| 摘要 |
PURPOSE: A power supply switching circuit for peripheral devices of a monitor is provided to selectively supply the secondary output voltage of the switch monitor power supply(SMPS) according to the operation of a monitor. CONSTITUTION: A power supply switching circuit for peripheral devices comprises: a low voltage detection piece(40) to detect the low voltage among the secondary voltages of the switching power supply(10A) of a monitor(10) in normal mode; a high voltage detection piece(50) to detect the high voltage among the secondary voltages of the switching power supply(10A) of a monitor(10) in power saving mode; and a over-voltage protection piece(70) to prevent the output of the over-voltage from a power switching piece(60).
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