Charging method adopting USB interfaces

A technology of a USB interface and a charging method, applied in the charging field using the USB interface, can solve the problems of high temperature of the control chip, high thermal power consumption, damage to the battery, etc., and achieve the effect of avoiding overheating and reducing thermal power consumption.

Inactive Publication Date: 2010-07-07
YITUO SCI & TECH CO LTD SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the existing technology are: when using independent power sources such as travel chargers, high voltage and high current are used for charging, and the voltage difference between the charging voltage and the battery voltage is too large, resulting in excessive thermal power consumption during charging , this thermal power consumption (

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0013] A charging method using a USB interface, which is used to charge various data devices with a USB interface. The USB charging interface can be connected to a USB interface on a computer or to a USB of an independent charger such as a travel charger. Output Interface. The charging voltage is uniformly set to the rated voltage of the rechargeable battery close to the data equipment, that is, 4.5V-5.6V, so as to reduce the calorific value during charging.

[0014] Because when the USB cable from the computer is plugged in, the controller of the handheld device will establish a data link with the computer through the USB port and generate data exchange, but when the travel charging power supply is plugged in, it is impossible to establish a data link, so in the software of the control module In the process, by distinguishing the link mark, the two different power sources are distinguished, so that charging currents of different sizes are set in the charging circuit.

[0015...

Embodiment approach 2

[0018] A charging method using a USB interface, which is different from Embodiment 1 in that: two data pins in the USB interface of an independent charger such as a travel charger are short-circuited, when the USB interface of the data device is connected to the USB interface of the charger When connecting, the two data pins of the USB interface of the data device are short-circuited. Since the data pin DATA+ inside the USB interface on the data device is connected to a 5V high level through a pull-up resistor, and the data pin DATA- is in a high-impedance state, when shorted, the two data pins DATA+ and DATA - both present a high level.

[0019] When the USB interface of the data device is connected to the USB interface of the charger or the computer, if it is connected to an independent charger such as a travel charger whose DATA+ and DATA- pins are short-circuited, the control module will detect the two USB interfaces of the USB interface. The data pins DATA+ and DATA- bot...

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PUM

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Abstract

The invention discloses a charging method adopting USB interfaces, which is characterized in that after detecting voltage input on the power pins of the USB interfaces, a charge control module firstly detects the data pin signals of the USB interfaces and then sets different charge current for the batteries according to the difference of the data pin signals; if detecting that the two data wires of the USB interfaces are at high level, the charge control module sets high current for charging the batteries, or the charge control module sets low current for charging the batteries; the USB interfaces employ voltage of 4.5-5.6V. In the method, under the same low charge voltage, whether the inserted power supply is from the computer or the travel charger is judged by recognizing the data pin signals of the USB interfaces, thus setting different charge current for the batteries, solving the problem that the existing travel chargers have big current and big voltage when charging and reducing the heat power consumption during charging.

Description

technical field [0001] The invention relates to a charging method, in particular to a charging method using a USB interface. Background technique [0002] Now many hand-held terminal devices such as mobile phones, cameras, and PDAs use mini USB ports as the power ports of chargers, and you can use the ubiquitous computer USB ports to charge these hand-held peripherals, which is very convenient to use. However, because the current provided by the USB interface of the computer is very small, the general USB2.0 interface is 500mA, and the USB1.1 interface is 250mA, which makes the charging time too long. In order to provide a larger charging current, manufacturers of handheld peripherals generally provide travel chargers with USB ports. This travel charger is directly plugged into the mains power supply and can provide a larger charge than the USB port on the computer. Current, such as 800mA, 1000mA or even 1500mA, so as to achieve fast charging. [0003] In the current techn...

Claims

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Application Information

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IPC IPC(8): H01M10/44H02J7/00
CPCY02E60/12Y02E60/10
Inventor 孙燕翔
Owner YITUO SCI & TECH CO LTD SHENZHEN
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