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

Patent metadata

Field	Value
Publication number	US-10461549-B2
Application number	US-201815871546-A
Country	US
Kind code	B2
Filing date	Jan 15, 2018
Priority date	Aug 5, 2015
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

The disclosure discloses a mobile terminal, a DC-charging power source adaptor, and a charging method, where the mobile terminal detects whether two communication pins of a USB interface thereof are shorted, and if an inserted external device is a power source adaptor, then the mobile terminal communicates with the power source adaptor, so that the mobile terminal identifies automatically the type of the externally connected charging device. Also a specialized rapid charging mode is designed for a DC-charging power adaptor, so that a battery being charged routinely is DC-charged at large current using charging voltage output by the DC-charging power source adaptor, and a volt value of the charging voltage is adjusted dynamically to the varying voltage of the battery core.

First claim

The invention claimed is:

1. 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, in response to detecting insertion of an external device into the USB interface;
in response to determining that the two differential data pins are shorted, detecting, by the mobile terminal, whether the inserted external device is a DC-charging power source adaptor, and in response to determining that the inserted external device is the DC-charging power source adaptor, detecting, by the mobile terminal, voltage of a battery core of the mobile terminal;
when the voltage of the battery core lies in a range [S1, S2] delimited by preset DC-charging thresholds, controlling, by the mobile terminal, according to the current voltage of the battery core, the DC-charging power source adaptor to output charging voltage corresponding to the current voltage of the battery core to DC-charge the battery, wherein the range [S1, S2]delimited by the DC-charging thresholds is consistent with a voltage range of the battery core corresponding to a constant-current charging phase in a normal DCP charging mode; and
when the voltage of the battery core goes out of the range delimited by the DC-charging thresholds, instructing, by the mobile terminal, the DC-charging power source adaptor to output a constant charging voltage that is output by the DC-charging power source adaptor by default, and receiving, by the mobile terminal, the constant charging voltage output by the DC-charging power source adaptor;
wherein when the voltage of the battery core is less than S1, the battery is pre-charged by a power source managing chip of the mobile terminal at a small current, and when the voltage of the battery core is more than S2, the battery is charged by the power source managing chip of the mobile terminal at constant voltage.

2. The method for charging the mobile terminal of claim 1 , wherein detecting, by the mobile terminal, whether the inserted external device is a DC-charging power source adaptor comprises:
outputting, by the mobile terminal, a signal instructing the external device to switch two communication pins of a charging interface of the external device from being shorted by default to being disconnected; and
sending, by the mobile terminal, a handshake instruction to the external device after a preset delay period of time, and in response to receiving a successful handshake acknowledgement, determining that the inserted external device is a DC-charging power source adaptor.

3. The method for charging the mobile terminal of claim 2 , further comprising:
in response to receiving an acknowledgement indicating handshake failure or not receiving an acknowledgement, determining, by the mobile terminal, that the inserted external device is a normal power source adaptor, and starting the normal DCP charging mode.

4. The method for charging the mobile terminal of claim 1 , wherein detecting, by the mobile terminal, whether the inserted external device is a DC-charging power source adaptor comprises:
waiting, by the mobile terminal, a preset wait period of time for receiving a communication command from the external device; and
in response to receiving the communication command, determining, by the mobile terminal, that the inserted external device is a DC-charging power source adaptor.

5. The method for charging the mobile terminal of claim 4 , further comprising:
in response to receiving no communication command within the preset wait period of time, determining, by the mobile terminal, that the inserted external device is a normal power source adaptor, and starting the normal DCP charging mode.

6. The method for charging the mobile terminal of claim 1 , wherein detecting, by the mobile terminal, whether the inserted external device is a DC-charging power source adaptor comprises:
sending, by the mobile terminal, a communication command to the external device at regular intervals, and waiting for reception of a response command returned from the external device, in a preset wait period of time, and in response to receiving a valid response command in the wait period of time, determining, by the mobile terminal, that the inserted external device is a DC-charging power source adaptor.

7. The method for charging the mobile terminal of claim 6 , further comprising:
in response to receiving no valid response command in the wait period of time, determining, by the mobile terminal, that the inserted external device is a normal power source adaptor, and starting the normal DCP charging mode.

8. The method for charging the mobile terminal of claim 1 , the method further comprising:
determining, by the mobile terminal, that the inserted external device is a host, and starting a normal SDP charging mode, in response to detecting that the two differential data pins of the USB interface of the mobile terminal are not shorted.

9. The method for charging the mobile terminal of claim 1 , wherein when controlling, by the mobile terminal, the DC-charging power source adaptor to output charging voltage corresponding to the current voltage of the battery core according to the current voltage of the battery core, the method further comprises:
sending, by the mobile terminal, a target charging current value I targ , and a charging current maximum value I max to the DC-charging power source adaptor.

10. A mobile terminal, comprising:
a battery configured to store electrical energy;
a USB interface configured to engage with an external device; and
a microprocessor configured:
to determine whether two differential data pins of the USB interface are shorted, in response to detecting insertion of an external device into the USB interface;
in response to determining that the two differential data pins are shorted, to detect whether the inserted external device is a DC-charging power source adaptor;
in response to determining that the inserted external device is the DC-charging power source adaptor, to detect voltage of the battery core V bat real , and if the voltage of the battery core V bat real lies in a range [S1, S2] delimited by preset DC-charging thresholds, then to control, according to the current voltage of the battery core, the DC-charging power source adaptor to output a charging voltage corresponding to the current voltage of the battery core to DC-charging the battery; and
to perform one or more of:
a first DC-charging process where the microprocessor is configured to search a reference table by using the detected voltage of the battery core V bat real to obtain a target charging voltage value V out corresponding to an interval in which the detected voltage of the battery core V bat real belongs, and to transmit the target charging voltage value V out to the DC-charging power source adaptor to control the DC-charging power source adaptor to output the charging voltage; or
a second DC-charging process where the microprocessor is configured to transmit the detected voltage of the battery core V bat real to the DC-charging power source adaptor to control the DC-charging power source adaptor to search a reference table by using the detected voltage of the battery core V bat real to obtain a target charging voltage value V out corresponding to an interval in which the detected voltage of the battery core V bat real belongs, so the DC-charging power source adaptor outputs the charging voltage; or
a third DC-charging process where the microprocessor is configured to calculate a target charging voltage value V out according to the following:
I targ =I max −ΔI;

I max =min((V bat max −V bat real )/R bat , I allow ); an

Assignees

• 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