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Overcurrent detecting circuit of USB port

A detection circuit and overcurrent technology, applied in the direction of measuring current/voltage, protection against overcurrent, measuring devices, etc., can solve problems such as misjudgment of warning messages, misjudgment of USB port overcurrent, etc.

Inactive Publication Date: 2013-11-06
NANJING ASIATEK TECH LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the computer operating system enters the sleep state from the working state, because the 5V main power supply will be turned off, the high-level signal on the detection pin on the south bridge chip will change to a low-level signal, so it will misjudge the corresponding USB port. If there is an overcurrent, the computer operating system will return to the working state from the sleep state, and a warning message of misjudgment will be generated.

Method used

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  • Overcurrent detecting circuit of USB port

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Embodiment Construction

[0021] Please refer to figure 1 , the USB port overcurrent detection circuit 10 of the present invention is located on a computer mainboard, and is used to detect the current flowing through the power supply pin VCC of a USB port 20 on the mainboard, and on the power supply pin VCC When the current on the bridge exceeds the preset value, a south bridge chip 30 is notified to perform subsequent operations. A preferred embodiment of the USB port overcurrent detection circuit 10 includes a control signal input terminal A, a main voltage terminal Vcc, a backup voltage terminal Vsb, a detection signal output terminal B, a fuse FS, and three capacitors C1-C3, a diode D, four resistors R1-R4, and an electric switch such as a PNP transistor Q.

[0022] The main voltage terminal Vcc is used to receive a main power supply (such as a 5V main power supply) on the motherboard, the main voltage terminal Vcc is also grounded through the capacitor C1, and connected to the diode through the f...

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Abstract

A overcurrent detecting circuit of USB port is disclosed. The overcurrent detecting circuit comprises: a control signal input terminal, a main voltage terminal, a standby voltage terminal, a detecting signal output terminal, a fuse, a diode, a resistor and an electric switch. The main voltage terminal is connected with an anode of the diode through the fuse and is connected with a power supply pin of the USB port to be detected. A cathode of the diode is connected with the detecting signal output terminal. The resistor is connected between the detecting signal output terminal and ground. The control signal input terminal is connected with a control terminal of the electric switch. A first terminal of the electric switch is connected with the standby voltage terminal. A second terminal of the electric switch is connected with the detecting signal output terminal. The overcurrent detecting circuit of the USB port can effectively prevent misjudgment of overcurrent.

Description

technical field [0001] The invention relates to a voltage detection circuit, in particular to an overcurrent detection circuit for a USB port. Background technique [0002] At present, USB ports have been widely used on computer motherboards. Usually, a USB port overcurrent detection circuit will be designed on the computer motherboard to provide a corresponding detection circuit on the south bridge chip when the USB port has an overcurrent situation. The pin sends a low-level signal, and the south bridge chip cuts off the USB port according to the received low-level signal and sends a warning message to the user's operation interface through the computer operating system, and then reminds the user to correspond to the USB port. Overcurrent. However, when the computer operating system enters the sleep state from the working state, because the 5V main power supply will be turned off, the high-level signal on the detection pin on the south bridge chip will change to a low-lev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/08G01R19/165
Inventor 黄腾贤饶昆益
Owner NANJING ASIATEK TECH LTD