USB charger, mobile terminal and charging control method

A charging control method and mobile terminal technology, which are applied in the directions of exchange data chargers, current collectors, electric vehicles, etc., can solve the problems of increasing voltage drop and decreasing voltage, achieving high accuracy and stability, and simple and good implementation. The effect of mutual compatibility

Active Publication Date: 2015-03-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing mature scheme of switching charging circuit can generally support a maximum charging current of 1.5A. Large current charging has very high requirements for the wire of the charger. This is because: when the output current increases, the input current also increases. The voltage drop caused by the impedance of the USB cable will also incre

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  • USB charger, mobile terminal and charging control method
  • USB charger, mobile terminal and charging control method
  • USB charger, mobile terminal and charging control method

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Embodiment Construction

[0042] In order to describe the technical content, structural features, objectives and effects of the present invention in detail, the specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0043]As mentioned above, the voltage drop caused by the impedance of the USB wire is a very important reason for limiting the high current charging of the mobile terminal. The USB charger provided by the invention can perform two-way communication with the mobile terminal, and can increase or decrease the voltage of the charger by intelligently controlling the output of the charger. Therefore, when the charger voltage is incr...

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Abstract

The invention provides a USB charger, a mobile terminal using the USB charger and a charging control method of the mobile terminal. The USB charger, which is suitable for charging the mobile terminal, comprises a first logic control unit. The USB charger is suitable for realizing both-way communication with the mobile terminal through the first logic control unit. The USB charger sends a maximum output capability signal of the USB charger to the mobile terminal through the first logic control unit, receives a charging voltage request signal sent by the mobile terminal and adjusts the output voltage of the USB charger according to the charging voltage request. Two signal lines are utilized between the USB charger and the mobile terminal provided in the embodiment of the invention, and both-way synchronous communication is realized through a pulse coding and decoding protocol, so that quick and safe larger-current charging is realized, and the realization method is simple.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a USB charger, a mobile terminal using the USB charger and a charging control method thereof. Background technique [0002] The characteristics of the step-down switching power supply conversion circuit: the output voltage is lower than the input voltage, the output current is higher than the input current, and the output power is slightly lower than the input power, so the efficiency of the entire conversion circuit is relatively high, and the heat dissipation power on the conversion circuit is relatively small . If the output voltage is not much different from the input voltage, then the input current is not much different from the output current. [0003] Please refer to figure 1 , figure 1 is the circuit schematic of a standard USB charger. The USB charger has four pins, which are respectively connected to two data signal lines (D+ and D-), a power line (VBUS) and a gr...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/00036H02J7/00047H02J7/00
Inventor 雷鹏陈良金梁旺平栾国兵张富强张明威
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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