The method of supporting the fast charging of the mobile phone through the usb port of the vehicle terminal
A vehicle-mounted terminal and fast charging technology, which is applied to vehicle components, circuits or fluid pipelines, transportation and packaging, etc., can solve the problems of increased material costs, unsatisfactory, slow charging of mobile phones, etc., and achieve the effect of reducing material costs
Active Publication Date: 2018-12-21
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology
In order to avoid mutual interference between the data transmission function and the charging function, the charging current of the USB port of the car terminal is generally limited to less than 1A, which cannot meet the charging requirements of most mobile phones at 1.5A or even 2.1A at full load. Charging is very slow
In order to solve the above problems, car manufacturers generally add a special charging USB port on the vehicle, which is only used for charging mobile phones, but this method increases the cost of materials by tens or even hundreds of dollars
Method used
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[0014] The present invention will be further described below in conjunction with accompanying drawing.
[0015] There are many kinds of USB devices on the market, some of which have built-in lithium batteries and need to be charged, such as mobile phones and cameras. Some do not have lithium batteries, such as: U disk. For a USB device with a built-in lithium battery, in order to ensure the normal use of the USB device with the lithium battery, it is necessary to charge the lithium battery of the USB device. According to the USB charging specification released in 2009: "YD-T1591-2009" (national standard), "Battery Charging Specification, Revision 1.2" standard (BC1.2), there are three configuration methods for USB charging as follows, three configuration methods and The maximum charging current supported is as follows:
[0016] (1) Standard downstream port (SDP): The maximum supply current is 500mA.
[0017] (2) Charging Downlink Port (CDP): The maximum power supply current...
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The invention discloses a method for supporting mobile phone quick charge on a vehicle terminal USB port. The method comprises: step 1, when a USB device is inserted into a vehicle terminal USB port, the vehicle terminal USB port automatically identifying the interface type of the USB device; step 2, when the USB device has just one interface type and the interface type is USB_CLASS_MASS_STORAGE, determining the USB device to be a U disk, identifying internal data of the USB device; when the USB device has other types of interfaces except the USB_CLASS_MASS_STORAGE or USB__CLASS_STILL_IMAGE, determining the USB device to be an intelligent terminal with a lithium battery, providing a quick charging mode and a data transmission mode for a user to select, when a user selects the quick charging mode, the vehicle terminal USB port automatically setting in a DCP mode, and charging the USB device in full load, when the user selects the data transmission mode, the vehicle terminal USB port automatically setting in a CDP mode, identifying internal data of the USB device and limiting charging current. The method can support data transmission and quick charging functions on the premise of not increasing material cost.
Description
technical field [0001] The invention belongs to the USB port of a vehicle-mounted terminal, and in particular relates to a method for the USB port of a vehicle-mounted terminal to support fast charging of a mobile phone. Background technique [0002] Most of the existing vehicle-mounted terminal USB ports have a charging function and a data transmission function at the same time, and are used for playing audio and video files in the U disk for users, and for charging mobile devices (mainly Android systems and IOS systems). In order to avoid mutual interference between the data transmission function and the charging function, the charging current of the USB port of the vehicle terminal is generally limited to less than 1A, which cannot meet the charging requirements of most mobile phones at 1.5A or even 2.1A at full load. Charging is very slow. In order to solve the above problems, car manufacturers generally add a special charging USB port on the vehicle, which is only used...
Claims
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IPC IPC(8): B60R16/02
CPCB60R16/02
Inventor 肖建辉
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD