| 摘要 |
A plug-in adapter includes a transformer having a primary winding capable of being coupled to an AC power source and a secondary winding configured to provide an output charging voltage. The plug-in adapter also includes a voltage sensing connection configured to sense an external device voltage. Additionally, the plug-in adapter includes an adapter isolation switch coupled between the primary winding and the AC power source and configured to close by application of the external device voltage thereby providing the output charging voltage, wherein removal of the external device voltage opens the adapter isolation switch thereby substantially isolating the primary winding from the AC voltage source. In other aspects, a method of operating a plug-in adapter and a plug-in adapter system are provided.
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