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USB port detecting circuit

  • US 8,443,130 B2
  • Filed: 06/27/2011
  • Issued: 05/14/2013
  • Est. Priority Date: 12/15/2010
  • Status: Expired due to Fees
First Claim
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1. A Universal Series Bus (USB) port detecting circuit for detecting whether a voltage of a USB port of an electronic device is within a standard range, the USB port detecting circuit comprising:

  • a voltage comparing circuit, adapted to compare the voltage of the USB port with a reference voltage and output voltage signals according to a comparing result; and

    an indicating circuit, connected to the voltage comparing circuit, adapted to receive the voltage signals and indicate whether the voltage of the USB port is within the standard ranges;

    a voltage dividing circuit connected to the voltage comparing circuit, the voltage dividing circuit adapted to divide the voltage of the USB port before sending a divided voltage to the voltage comparing circuit, the voltage dividing circuit comprising a first resistor, a second resistor, and a third resistor connected in series; and

    the voltage comparing circuit comprising a voltage comparing chip, the voltage comparing chip comprising a first comparator and a second comparator, a negative input terminal of the first comparator connected to a first node to which the first resistor and the second resistor are connected, an output terminal of the first comparator connected to the indicating circuit, and a positive input terminal of the second comparator connected to a second node to which the second resistor and the third resistor are connected, an output terminal of the second comparator connected to the indicating circuit.

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