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1. 发明授权

US08772966B1 System and method for selecting a power supply source 有权
标题翻译：选择电源的系统和方法
公开(公告)号：US08772966B1
公开(公告)日：2014-07-08
申请号：US13110162
申请日：2011-05-18
申请人： Abhishek Agrawal , Priyank Shukla
发明人： Abhishek Agrawal , Priyank Shukla
IPC分类号： H02J1/00 , H02J3/00
CPC分类号： H02J1/08 , H02J1/108 , Y10T307/696
摘要： A power supply source selection circuit is provided with a comparator and a switch. The comparator has an input to accept a first reference voltage directly proportional to a bandgap reference voltage. For example, the bandgap voltage may be derived from a battery voltage. The comparator has an input to accept a second reference voltage directly proportional to a first supply voltage (e.g., a line voltage), and an output to supply a switch signal in response to comparing the second reference voltage to the first reference voltage. The switch has an input to accept the first supply voltage, an input to accept a second supply voltage, and input to accept the switch signal. The switch has an output to supply a third supply voltage to a regulator. The third voltage has a voltage potential less than or equal to a maximum voltage value. The switch selects between the first supply voltage and the second supply voltage in response to the switch signal.
摘要翻译：电源选择电路设有比较器和开关。比较器具有接收与带隙参考电压成正比的第一参考电压的输入。例如，带隙电压可以从电池电压导出。比较器具有输入以接受与第一电源电压（例如，线路电压）成正比的第二参考电压，以及响应于将第二参考电压与第一参考电压进行比较而提供开关信号的输出。该开关具有接受第一电源电压的输入端，接受第二电源电压的输入端，并接受开关信号的输入。该开关具有向调节器提供第三电源电压的输出。第三电压具有小于或等于最大电压值的电压电位。该开关响应于开关信号在第一电源电压和第二电源电压之间进行选择。

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