USB (universal serial bus) interface charge handshaking method and quickly-chargeable power adapter

A power adapter, USB interface technology, applied in the direction of collectors, battery circuit devices, instruments, etc., can solve the problems of inability to output high voltage, high hardware circuit requirements, high implementation costs, low hardware circuit requirements, and simple implementation methods. , to achieve the effect of low cost

Active Publication Date: 2014-08-06
XIAN YIPU COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the first solution above is that it cannot output high voltage to provide large input power to the charging chip; the disadvantage of the second solution is that the USB device and the power adapter need to identify DP and DM signals of different logics, which requires high hardware circuits and high implementatio

Method used

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  • USB (universal serial bus) interface charge handshaking method and quickly-chargeable power adapter
  • USB (universal serial bus) interface charge handshaking method and quickly-chargeable power adapter

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Embodiment Construction

[0027] The realization of the present invention is described by taking a mobile phone and a power adapter for charging the mobile phone as examples. The mobile phone's power adapter can output two voltages: standard voltage 5.0V and high voltage 12.0V. The default output standard voltage is 5.0V and the maximum output current is 1.0A.

[0028] Such as figure 1 , a power adapter capable of quickly charging a mobile phone, including an AC / DC circuit 1, a control circuit A2 and a VBUS current detection circuit 3.

[0029] AC / DC circuit realizes the conversion of AC voltage to DC voltage, the initial value of the output voltage is 5.0V, and the output voltage value is adjustable. The AD / DC circuit can directly use the AD / DC circuit on the existing power adapter without changing.

[0030] The control circuit A is used to control the output voltage of the AC / DC circuit.

[0031] The VBUS current detection circuit, by identifying the current on and off on the VBUS, restores the pr...

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Abstract

The invention provides a USB (universal serial bus) interface charge handshaking method and a quickly-chargeable power adapter. The method includes that the power adapter and USB equipment are connected through a USB cable; a charge management circuit of the USB equipment controls connection and disconnection of a VBUS according to agreed codes precured by the USB equipment; the power adapter restores the agreed codes precured on the USB equipment by identifying connection and disconnection of the VBUS; if the restored agreed codes on the USB equipment are consistent with agreed codes precured by the power adapter, showing that handshaking succeeds, and otherwise, showing that handshaking fails. The power adapter comprises a VBUS current detection circuit, a control circuit A and an AC/DC (alternating current/direct current) circuit, wherein the control circuit A and the AC/DC circuit are connected to the output end of the VBUS current detection circuit sequentially. On the premise that output current of the power adapter is unchanged, output voltage provided by the power adapter to the USB equipment is increased, higher input power is provided, and charging is accelerated.

Description

technical field [0001] The invention belongs to the field of USB interface charging, and in particular relates to a USB interface charging handshake method and a fast-charging power adapter. Background technique [0002] There are currently two charging voltages based on the USB interface. Option one is the standard 5.0V voltage output, and the voltage is not variable. The second scheme is represented by Qualcomm in the United States. The output voltage is variable. The USB device and the power adapter shake hands through the DP and DM signals of the USB interface to determine whether the output voltage is 5.0V output or other high-voltage output, which has reached high voltage. The purpose of power transmission and fast charging. [0003] The disadvantage of the first solution above is that it cannot output high voltage to provide large input power to the charging chip; the disadvantage of the second solution is that the USB device and the power adapter need to identify D...

Claims

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Application Information

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IPC IPC(8): H02J7/00G06F13/38
Inventor 段崇修
Owner XIAN YIPU COMM TECH
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