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A usb device detection system and method

A device detection and USB interface technology, applied in the USB field, can solve problems such as high cost, external devices cannot be fully charged, and limited current sampling circuit accuracy, saving cost and space, saving power sampling resistance, and improving user experience. Effect

Active Publication Date: 2021-06-08
HYNETEK SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1. Additional current sampling circuits are required, including sampling resistors, current signal amplification circuits, current signal comparison circuits, etc., and the cost is relatively high
[0010] 2. The preset charging current threshold Iref is limited by the accuracy of the current sampling circuit. When the Load flows through a small current for charging, the current sampling circuit may misjudge that the Load has been pulled out, turn off Qb, and then restart Vdet. detection, and turn on Qb again, causing the external device cannot be fully charged

Method used

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  • A usb device detection system and method
  • A usb device detection system and method
  • A usb device detection system and method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0039] Such as figure 2As shown, a USB device detection system includes: a VBUS power supply unit 1, an insertion detection unit 2, a GATE saturation control unit 3, an extraction detection unit 4 and a logic control unit 5, and the VBUS power supply unit 1 passes the VBUS of the USB interface terminal is connected with the positive pole of the load, the negative pole of the load is connected with the GND terminal of the USB interface and the MOS transistor Qb in turn and then grounded, the input terminal of the insertion detection unit 2 is connected with the GND terminal of the USB interface, and the pull-out detection unit 4 The input terminal is connected with the gate of MOS transistor Qb, the output terminals of the insertion detection unit 2 and the extraction detection unit 4 are respectively connected with the signal input terminal ATCH end and the DTCH end of the logic control unit 5, and the signal output of the logic control unit 5 The terminal EN_G is connected t...

Embodiment 2

[0042] Such as image 3 As shown, the insertion detection unit 2 includes a voltage comparator U1, the non-inverting input terminal Vdet of the voltage comparator U1 is connected to the GND terminal of the USB interface, and the inverting input terminal Vref of the voltage comparator U1 is connected to the threshold voltage to generate The output terminals of the circuit are connected, and the threshold voltage generation circuit provides a reference threshold voltage for the inverting input terminal of the voltage comparator U1, and the output terminal of the voltage comparator U1 is connected to the input terminal ATCH of the logic control unit 5 .

[0043] Specifically, the insertion detection unit 2 is used to automatically detect the connected device after the external load (hereinafter referred to as Load) is connected; when there is no external Load, the MOS transistor Qb is in the off state, and the logic control unit 5 The output signal EN_G=0, at this time, because t...

Embodiment 3

[0047] Such as Figure 4 As shown, the GATE saturation control unit 3 unit includes an error operational amplifier U2, the inverting input terminal VLM of the error operational amplifier U2 is connected to the output terminal of the threshold voltage generation circuit, and the threshold voltage generation circuit is the error operation amplifier U2. The inverting input terminal of the amplifier U2 provides a reference threshold voltage, the non-inverting input terminal of the error operational amplifier U2 is connected in series with the output terminal of the error operational amplifier U2 after the capacitor C1 and the resistor Rc are connected in series, and the output terminal of the error operational amplifier U2 The wires connected to the resistor Rc are respectively connected to the gate of the MOS transistor Qb and the anode of the diode D1 , and the cathode of the diode D1 is connected to the output terminal EN_G of the logic control unit 5 .

[0048] Specifically, t...

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Abstract

A USB device detection system and method disclosed in the present invention include: a VBUS power supply unit, an insertion detection unit, a GATE saturation control unit, a pull-out detection unit and a logic control unit, the output terminals of the insertion detection unit and the pull-out detection unit Connect with the signal input end ATCH end, DTCH end of logic control unit respectively, the signal output end EN_G end of logic control unit is connected with the input end of GATE saturation control unit; The present invention collects and inserts detection unit, GATE saturation control unit through logic control unit , The signal detected by the unplugging detection unit can detect the insertion and unplugging of the load in real time, saves the current sampling circuit with high cost, saves the power sampling resistor, and greatly improves the minimum detectable unplugging current, to ensure that the external USB device can be fully charged to 100%, which improves the user experience.

Description

technical field [0001] The invention belongs to the technical field of USB, and in particular relates to a USB device detection system and method. Background technique [0002] Universal Serial Bus (English: Universal Serial Bus, abbreviation: USB) is a serial bus standard that connects computer systems and external devices. It is also a technical specification for input and output interfaces. It is widely used in personal computers and mobile devices. Information and communication products, and expanded to photographic equipment, digital TV (set-top box), game consoles and other related fields. [0003] The traditional USB is a commonly used interface, it only has 4 wires, two power supply and two signals, the signal is transmitted serially, and the speed can reach 480Mbps; it can meet various industrial and civil needs; at the same time, the traditional USB interface The maximum output voltage and current is: 5V1.5A. Some customized USB ports can reach a maximum of 20V a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/22G06F13/42
CPCG06F11/2273G06F11/221G06F13/4282Y02D10/00
Inventor 欧应阳
Owner HYNETEK SEMICON CO LTD
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