MOBILE TERMINAL AND RAPID CHARGING METHOD

• US 20170040821A1
• Filed: 03/22/2016
• Published: 02/09/2017
• Est. Priority Date: 08/05/2015
• Status: Active Grant

• Current Assignee: Hisense International Company Limited (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense USA Corporation (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Hisense Mobile Communications Technology Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Inventors: ZHAO, Yufeng, LI, Chunqian, DU, Wenjuan, YU, Maoxue
• Granted Patent: US 10,097,022 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H02J 7/0045 concerning the insertion or the connection of the batteries
• CPC Class Codes: H02J 7/0069 Charging or discharging for charge maintenance, battery initiation or rejuvenation
• CPC Class Codes: H02J 7/007184 in response to battery voltage gradient

Abstract

The application discloses a rapid charging method and a mobile terminal, which are proposed for a power source adaptor outputting dynamically adjustable voltage, where voltage of a battery core is divided into several intervals, and further in a segmented constant-current-like charging mode, a volt value of charging voltage output by the power source adaptor is adjusted dynamically according to an interval in which the core voltage of the battery in the mobile terminal while the battery is being charged lies, and the battery is DC-charged directly using the charging voltage output by the power source adaptor.

Claims

1. A mobile terminal, comprising:

a battery configured to store electric energy;

a USB interface configured to be connected with a DC-charging power source adaptor; and

a microprocessor configured to detect voltage of the battery upon detecting that the USB interface is connected with the DC-charging power source adaptor, and if the voltage of the battery lies in a range [S1, S2] delimited by preset DC-charging thresholds, to search, using an interval in which the voltage of the battery lies, a preset reference table for a target charging voltage value V_out corresponding to the interval, to send the target charging voltage value V_out to the DC-charging power source adaptor, and to control the charging voltage output by the DC-charging power source adaptor to DC-charge the battery, wherein the charging voltage is target charging voltage adjusted and output by the DC-charging power source adaptor according to the received target charging voltage value V_out.

2. The mobile terminal according to 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 lies in the range [S1, S2] delimited by the preset DC-charging thresholds, to be closed, and to transfer the charging voltage output by the DC-charging power adaptor directly to the battery to DC-charge the battery; and

a power 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 goes out of the range [S1, S2] delimited by the preset DC-charging thresholds, to receive the charging voltage output by the DC-charging power adaptor, and to charge the battery.

3. The mobile terminal according to claim 2, wherein the microprocessor is configured, upon detecting that the voltage of the battery is less than S1, to communicate with the DC-charging power source adaptor to instruct the DC-charging power source adaptor to output constant charging voltage by default, and to start the power source managing chip to pre-charge the battery at small current;

and upon detecting that the voltage of the battery is more than S2, to instruct the DC-charging power source adaptor to output constant charging voltage by default, and to start the power source managing chip to charge the battery at the constant voltage.

4. A rapid charging method, the method comprising:

detecting, by a mobile terminal, voltage of a battery thereof;

if the voltage of the battery lies in a range [S1, S2] delimited by preset DC-charging thresholds, then searching, using an interval in which the voltage of the battery lies, a preset reference table for a target charging voltage value Vout corresponding to the interval, and sending the target charging voltage value Vout to a DC-charging power source adaptor; and

transferring, by the mobile terminal, received charging voltage output by the DC-charging power source adaptor to the battery to DC-charge the battery, wherein the charging voltage is target charging voltage adjusted and output by the DC-charging power source adaptor according to the received target charging voltage value Vout.

5. The rapid charging method according to claim 4, wherein searching the reference table further comprises:

searching the reference table for a target charging current value Itarg corresponding to the interval in which the voltage of the battery lies.

6. The rapid charging method according to claim 5, further comprising:

detecting, by the mobile terminal, real charging current Ichg received by the mobile terminal; and

if the real charging current Ichg is less than the target charging current value Itarg, then adjusting up the target charging voltage value Vout by a preset value Δ

V, and sending the target charging voltage value Vout to the DC-charging power source adaptor.

7. The rapid charging method according to claim 5, further comprising:

detecting, by the mobile terminal, real charging current Ichg received by the mobile terminal; and

if the absolute value of the difference between the real charging current value Ichg and the target charging current value Itarg is more than a preset value Ie represents a controllable range of the difference between the real charging current value Ichg and the target charging current value Itarg, then stopping the battery from being charged.

8. The rapid charging method according to claim 5, wherein searching the reference table further comprises:

searching the reference table for a charging current maximum value Imax corresponding to the interval in which the voltage of the battery lies.

9. The rapid charging method according to claim 8, further comprising:

detecting, by the mobile terminal, real charging current value Ichg received by the mobile terminal; and

if the real charging current value Ichg is more than the charging current maximum value Imax, then stopping the battery from being charged.

10. The rapid charging method according to claim 4, wherein the charging current maximum value Imax is determined from the maximum terminal voltage supported by the battery, and an inner resistance of the battery;

the target charging current value Itarg is determined from the charging current maximum value Imax; and

the target charging voltage value Vout is determined from the target charging current value Itarg as well as a resistance value on a charging line, a resistance value on a circuit board of the mobile terminal, and the inner resistance of the battery.

11. The rapid charging method according to claim 10, wherein the voltage of the battery is voltage of a battery core, and Vout, Itarg, and Imax corresponding to each of the intervals are calculated in the equation of:

Imax=min((Vbat_max−

Vbat_real)/Rbat, Iallow),

Itarg=Imax−

Δ

I, and

Vout=Vbat_real+Itarg*(Rline+Rboard+Rbat),

where Rline represents the resistance value on the charging line, Rboard represents the resistance value on the circuit board of the mobile terminal, Rbat represents the inner resistance value of the battery, Vbat_max represents the maximum terminal voltage value supported by the battery, Vbat_real represents detected core voltage, Iallow represents the maximum safe charging current value selected while ensuring the safety of the battery being charged, and Δ

I represents a preset difference in current.

12. The rapid charging method according to claim 11, wherein the mobile terminal uses a lower bound value xi1 of the core voltage in the interval as the detected core voltage Vbat_real, and calculates the target charging voltage value Vout corresponding to the interval;

and

the mobile terminal uses an upper bound value xi1 of the core voltage in the interval as the detected core voltage Vbat_real, and calculates the charging current maximum value Imax corresponding to the interval

13. The rapid charging method according to claim 4, further comprising:

instructing, by the mobile terminal upon detecting that the voltage of the battery thereof is less than S1, the DC-charging power source adaptor to output constant charging voltage output by the DC-charging power source adaptor by default, and to transfer the constant charging voltage to a power source managing chip in the mobile terminal, and starting the power source managing chip to pre-charge the battery at small current; and

instructing, by the mobile terminal upon detecting that the voltage of the battery thereof is more than S2, the DC-charging power source adaptor to output constant charging voltage output by the DC-charging power source adaptor by default, and to transfer the constant charging voltage to a power source managing chip in the mobile terminal, and starting the power source managing chip to charge the battery at the constant voltage.