Charging method adopting USB interfaces

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...

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 (P=U*I, P: heat consumption power, U: voltage difference between the charging power supply and the battery, I: charging current) is mainly concentrated on the MOSFET (field effect tube) of the charging circuit, which is easy to use overheating, causing the temperature of the control chip of the USB handheld peripheral to be too high, or damaging the battery