| 摘要 |
An automatic switching device for the power source input range of a personal computer monitor is installed within the switchmode power source circuit of the monitor and includes a comparator and a relay arranged so that, irrespective of whether the power source is at a 110V or 220V voltage level, the rectifying circuit of the switchmode power source circuit is automatically switched to a voltage doubler circuit or a bridge rectifier circuit as appropriate for reducing power losses and saving energy.
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