| 摘要 |
<p>A circuit is provided. The circuit includes a control circuit, a voltage sensor coupled to the control circuit, an indicator signal coupled to the control circuit, and at least one current source. The control circuit, responsive to the voltage sensor, is configured to detect a first classification voltage within a classification voltage range defined by a lower classification voltage limit and upper classification voltage limit, detect, after detecting the first classification voltage, an indexing voltage outside of the classification voltage range, and detect a second classification voltage within the classification voltage range. The at least one current source provides a first and second predetermined classification current responsive to the first classification voltage and the second classification voltage, respectively. The control circuit is configured to set the indicator signal to a first predetermined state indicating a power type based on the detected first classification voltage, indexing voltage and second classification voltage.</p> |
