USB port detecting circuit
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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Abstract
A Universal Series Bus USB port detection and testing circuit, configured to detect the voltage output of a USB port of an electronic device, includes a voltage comparing circuit and an indicating circuit. The indicating circuit is connected to an output terminal of the voltage comparing circuit. The voltage comparing circuit compares the voltage output from the USB port against a reference voltage and output a signal whereby the indicating circuit indicates whether the voltage is within, or above, or below, the standard range.
23 Citations
18 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Universal Series Bus (USB) port detecting circuit for detecting a USB port having a first terminal and a second terminal, the USB port detecting circuit comprising:
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a voltage dividing circuit adapted to divide a voltage between the first terminal and the second terminal and output a first divided voltage and a second divided voltage; a voltage comparing circuit, connected to the voltage dividing circuit, adapted to compare the first divided voltage and the second divided voltage with a reference voltage, wherein when the voltage of the USB port is within the standard range, the first divided voltage is greater than the reference voltage and the second divided voltage is less than the reference voltage, the voltage comparing circuit output a first voltage signal;
when the voltage of the USB port is greater than the standard range, the first divided voltage and the second divided voltage are both greater than the reference voltage, the voltage comparing circuit output a second voltage signal;
when the voltage of the USB port are less than the standard range, the first divided voltage and the second divided voltage is both less than the reference voltage, the voltage comparing circuit output a third voltage signal; andan indicating circuit, connected to the voltage comparing circuit, adapted to receive the voltage signals and indicate whether the voltage between the first terminal and the second terminal is within a predetermined range. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification