| 摘要 |
The USB AC adapter with automatic built in power switch comprises of an AC power supply circuit, an AC control circuit, a monitoring circuit, and a circuit for the light emitting diode indicator. The monitoring circuit further comprises of a standby power supply circuit, a microcontroller circuit, a circuit for USB chassis detector, a USB data monitor circuit, and a current monitor circuit. The AC power supply circuit is electrically connected to the alternating current source and converts the alternating current to direct current for charging the rechargeable battery of an electronic device. The AC control circuit acts as a switch to turn the AC power supply on and off. The monitor circuit detects whether an electronic device is connected to the adapter and also whether the charging process is completed. The light emitting diode indicator is used to indicate the power and charging status of the adapter.
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