Mobile terminal, DC-charging power source adaptor, and charging method

Patent metadata

Field	Value
Publication number	US-9899848-B2
Application number	US-201615064010-A
Country	US
Kind code	B2
Filing date	Mar 8, 2016
Priority date	Aug 5, 2015
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The disclosure discloses a mobile terminal, a DC-charging power source adaptor, and a charging method, the mobile terminal comprising: a battery configured to store electrical energy; a USB interface configured to be engaged with an external device; and a microprocessor configured to determine whether two differential data pins of the USB interface are shorted, upon detecting an external device being inserted into the USB interface; and if so, to communicate with the inserted external device, wherein if the external device is a DC-charging power source adaptor, then the DC-charging power source adaptor switches two communication pins of a charging interface thereof from being shorted by default to being disconnected, and communicates with the microprocessor; and the microprocessor detects voltage of the battery after communicating successfully with the DC-charging power source adaptor, and if the voltage of a battery core lies in a range delimited by preset DC-charging thresholds, then the microprocessor controls the battery to be DC-charged using charging voltage output by the DC-charging power source adaptor, and determines a value of the charging voltage of the DC-charging power source adaptor from the current voltage of the battery core.

First claim

The invention claimed is:

1. A mobile terminal, comprising:
a battery configured to store electrical energy;
a USB interface configured to be engaged with an external device; and
a microprocessor configured to determine whether two differential data pins of the USB interface are shorted, upon detecting an external device being inserted into the USB interface; and if so, to communicate with the inserted external device, wherein if the external device is a DC-charging power source adaptor, then the DC-charging power source adaptor switches two communication pins of a charging interface thereof from being shorted by default to being disconnected, and communicates with the microprocessor; and the microprocessor detects voltage of the battery after communicating successfully with the DC-charging power source adaptor, and if the voltage of a battery core lies in a range delimited by preset DC-charging thresholds, then the microprocessor controls the battery to be DC-charged using charging voltage output by the DC-charging power source adaptor, and determines a value of the charging voltage of the DC-charging power source adaptor from the current voltage of the battery core.

2. The mobile terminal of claim 1 , further comprising:
a DC-charging switch, connected between the USB interface and the battery, configured to be controlled by the microprocessor upon detecting that the voltage of the battery core lies in the range delimited by the preset DC-charging thresholds, to be closed to transmit the charging voltage output by the DC-charging power source adaptor directly to the battery to DC-charge the battery; and
a power source managing chip, connected between the USB interface and the battery, configured to be controlled by the microprocessor upon detecting that the voltage of the battery core goes out of the range delimited by the preset DC-charging thresholds, to receive the charging voltage output by the DC-charging power source adaptor to charge the battery.

3. A method for charging a mobile terminal, the method comprising:
determining, by the mobile terminal, whether two differential data pins of a USB interface thereof are shorted, upon detecting an external device being inserted into the USB interface;
if so, then communicating with the inserted external device;
if the external device is a DC-charging power source adaptor, then switching, by the DC-charging power source adaptor, two communication pins of a charging interface thereof from being shorted by default to being disconnected, and communicating with the mobile terminal; and
detecting, by the mobile terminal, voltage of the battery after communicating successfully with the DC-charging power source adaptor, and if the voltage of a battery core lies in a range delimited by preset DC-charging thresholds, then charging the battery directly using charging voltage output by the DC-charging power source adaptor, and determining a value of the charging voltage of the DC-charging power source adaptor from the current voltage of the battery core.

4. The method for charging a mobile terminal of claim 3 , wherein communicating, by the mobile terminal, with the inserted external device comprises:
outputting, by the mobile terminal, a specific pulse waveform to the external device; and
exchanging, by the mobile terminal, a handshake instruction with the external device after a preset delay period of time, and if the handshake succeeds, then determining that the inserted external device is the DC-charging power source adaptor.

5. The method for charging a mobile terminal of claim 3 , wherein communicating, by the mobile terminal, with the inserted external device comprises:
waiting, by the mobile terminal, for reception of a communication command sent by the external device in a preset wait period of time, and if the communication command is received, then determining that the inserted external device is the DC-charging power source adaptor; or
sending, by the mobile terminal, a communication command to the external device at preset instances of time, and waiting for reception of a response command which is fed back, in a preset wait period of time, and if the valid response command is received in the wait period of time, then determining that the inserted external device is the DC-charging power source adaptor.

6. The method for charging a mobile terminal of claim 3 , wherein the battery is charged directly using the charging voltage output by the DC-charging power source adaptor in one of the following three DC-charging processes:
(1) searching, by the mobile terminal, a preset reference table using the detected voltage V bat _ real of the battery core for a target charging voltage value V out corresponding to an interval in which V bat _ real lies, and sending the target charging voltage value V out to the DC-charging power source adaptor to determine the value of the charging voltage output by the DC-charging power source adaptor;
(2) sending, by the mobile terminal, the detected voltage V bat _ real of the battery core to the DC-charging power source adaptor, searching through the DC-charging power source adaptor a preset reference table using the detected voltage V bat _ real of the battery core for a target charging voltage value V out corresponding to an interval in which V bat _ real lies, and receiving the target charging voltage adjusted and output by the DC-charging power source adaptor; and
(3) determining, by the mobile terminal, a charging current maximum value I max from a maximum terminal voltage supported by the battery, and an inner resistance of the battery, further determining a target charging current value I targ corresponding to the current voltage V bat _ real of the battery core from I max , and further calculating a target charging voltage value V out from I targ as well as a resistance value on a charging line, a resistance valve on a circuit board of the mobile terminal, and an inner resistance of the battery, and sending the target charging voltage value V out to the DC-charging power source adaptor to determine the value of the charging voltage output by the DC-charging power source adaptor.

7. The method for charging a mobile terminal of claim 3 , wherein the range [S 1 , S 2 ] delimited by the DC-charging thresholds agrees with a voltage range of the battery core corresponding to a constant-current charging phase in a normal DCP charging mode; and if the voltage of the battery core is less than S 1 , the battery is pre-charged by a power source managing chip at small current, and if the voltage of the battery core is more than S 2 , the battery is charged by the power source managing chip at constant voltage; and
if the voltage of the battery core goes out of the range delimited by the DC-charging thresholds, then the mobile terminal instructs the DC-charging power source adaptor to output constant charging voltage output by the DC-charging power source adaptor by default.

8. The method for charging a mobile terminal of claim 4 , wherein the range [S 1 , S 2 ] delimited by the DC-charging thresholds agrees with a voltage range of the battery core corresponding to a constant-current charging phase in a normal DCP charging mode; and if the voltage of the battery core is less than S 1 , the battery is pre-charged by a power source managing chip at small current, and if the voltage of the battery core is more than S 2 , the battery is charged by the power source managing chip at constant voltage; and
if the voltage of the battery core goes out of the range delimited by the DC-charging thresholds, then the mobile terminal instructs the DC-charging power source adaptor to output constant charging voltage output by the DC-charging power source

Assignees

• Hisense Mobile Communications Tech Co Ltd
• Hisense Mobile Communications Tech Co Ltd
• Hisense Usa Corp
• Hisense Int Co Ltd

Inventors

• Hu Ermeng
• Yin Rongyi
• Zhang Xintao
• Du Wenjuan

Classifications

• H02J7/731

  specially adapted for holding portable devices containing batteries (H02J7/751 takes precedence) · CPC title

• H02J7/42

  with electronic devices having internal batteries, e.g. mobile phones · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/94

  in response to battery current · CPC title

• H02J7/685 Primary

  using connection detecting circuits (H02J7/68 takes precedence) · CPC title