Mobile Terminal, DC-Charging Power Source Adaptor, And Rapid Charging Method

• US 20170040805A1
• Filed: 02/24/2016
• 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: HUANG, Yaling, ZHANG, Naifeng, LI, Chunqian, DU, Wenjuan
• Granted Patent: US 10,044,217 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

This disclosure provides a mobile terminal, a DC-charging power source adaptor, and a rapid charging method, which are proposed for a power source adaptor outputting dynamically adjustable voltage, where core voltage of a battery 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 the 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;

if the voltage of the battery is in a range [S1, S2] delimited by preset DC-charging thresholds, to send the voltage of the battery to the DC-charging power source adaptor, so that the DC-charging power source adaptor outputs target charging voltage corresponding to the current voltage of the battery, and to transmit the target charging voltage output by the DC-charging power source adaptor directly to the battery to DC-charging the battery.

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 to be closed, when the microprocessor detects that the voltage of the battery is in the range [S1, S2] delimited by the preset DC-charging thresholds, 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 managing chip, connected between the USB interface and the battery, configured to be controlled by the microprocessor to receive the charging voltage output by the DC-charging power source adaptor and to charge the battery, when the microprocessor detects that the voltage of the battery is out of the range [S1, S2] delimited by the preset DC-charging thresholds.

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 output by the DC-charging power source adaptor 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 the constant charging voltage output by the DC-charging power source adaptor by default, and to start the power source managing chip to charge the battery at the constant voltage.

4. A DC-charging power source adaptor, comprising:

a charging interface configured to be externally connected with a mobile terminal;

an AC to DC converting unit configured to convert an AC input power source into charging voltage required for the mobile terminal, and to output the charging voltage via the charging interface; and

a controlling unit, connected with the charging interface, configured to communicate with the mobile terminal after the charging interface is connected with the mobile terminal, to receive voltage of a battery, in a range delimited by DC-charging thresholds, sent by the mobile terminal, to search a preset reference table using the voltage of the battery for target charging voltage value V_out corresponding to an interval in which the voltage of the battery lies, and to adjust the charging voltage output by the AC to DC converting unit to the target charging voltage value V_out.

5. The DC-charging power source adaptor according to claim 4, further comprising:

a current detecting unit configured to detect in real time charging current I_chg output via the charging interface, and to feed back the charging current to the controlling unit; and

a switch circuit connected between the AC to DC converting unit and the charging interface, wherein;

the controlling unit is configured to search the reference table using the voltage of the battery sent by the mobile terminal for a target charging current value I_targ and a charging current maximum value I_max corresponding to the interval in which the voltage of the battery lies;

upon detecting that I_targ−

I_e≦

I_targ, to control the DC-charging power source adaptor to adjust its output charging voltage up by a preset value Δ

V; and

upon detecting that the absolute value of the difference between I_chg and I_targ is more than I_e or I_chg is more than a charging current maximum value I_max, to control the switch circuit to disconnect a charging voltage transmission line between the DC-charging power source adaptor and the charging interface;

wherein I_e represents a controllable range of the difference between the real charging current value of the DC-charging power source adaptor and the target charging current value.

6. The DC-charging power source adaptor according to claim 4, wherein the controlling unit is configured to adjust the DC-charging power source adaptor to output constant charging voltage output by the DC-charging power source adaptor by default, when the voltage of the battery of the mobile terminal is out of the range delimited by the preset DC-charging thresholds.

7. The DC-charging power source adaptor according to claim 5, wherein the controlling unit is configured to adjust the DC-charging power source adaptor to output constant charging voltage output by the DC-charging power source adaptor by default, when the voltage of the battery of the mobile terminal is out of the range delimited by the preset DC-charging thresholds.

8. A rapid charging method, comprising:

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

if the voltage of the battery is in a range [S1, S2] delimited by preset DC-charging thresholds, then sending the voltage of the battery to a DC-charging power source adaptor;

searching, by the DC-charging power source adaptor, a preset reference table using the voltage of the battery for target charging voltage value V_out corresponding to an interval in which the voltage of the battery lies;

adjusting, by the DC-charging power source adaptor, its output charging voltage to the target charging voltage value V_out; and

receiving, by the mobile terminal, the charging voltage output by the DC-charging power source adaptor, and transmitting the charging voltage to the battery to DC-charge the battery.

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

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

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

detecting, by the DC-charging power source adaptor, its output real charging current I_chg; and

if the real charging current I_chg is less than the target charging current value I_targ, then adjusting the target charging voltage value V_out up by a preset value Δ

V.

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

detecting, by the DC-charging power source adaptor, its output real charging current I_chg; and

if the absolute value of the difference between the real charging current I_chg and the target charging current value I_targ is more than a preset value I_e, then stopping the charging voltage from being output, wherein I_e represents a controllable range of the difference between the real charging current value and the target charging current value.

12. The rapid charging method according to claim 9, wherein searching the preset reference table further comprises:

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

13. The rapid charging method according to claim 12, further comprising:

detecting, by the DC-charging power source adaptor, its output real charging current I_chg; and

if the real charging current I_chg is more than the charging current maximum value I_max, then stopping the charging voltage from being output.

14. The rapid charging method according to claim 12, wherein the charging current maximum value I_max is determined from maximum terminal voltage supported by the battery, and inner resistance of the battery;

the target charging current value I_targ is determined from the charging current maximum value I_max; and

the target charging voltage value V_ont is determined from I_targ as well as a resistance value on the charging line, a resistance value on a circuit board of the terminal, and the inner resistance of the battery.

15. The rapid charging method according to claim 14, wherein V_out, I_targ and I_max corresponding to each of the intervals are calculated in the equations of:

I_max=min((V_{bat_max}−

V_{bat_real})/R_bat, I_allow),

I_targ=I_max−

Δ

I,

V_out=V_{bat_real}+I_targ*(R_line+R_board+R_bat).

wherein R_line represents the resistance value on the charging line;

R_board represents the resistance value on the circuit board of the mobile terminal;

R_bat represents the inner resistance value of the battery;

V_{bat_max} represents the maximum terminal voltage value supported by the battery;

I_allow 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.

16. The rapid charging method according to claim 15, wherein the DC-charging power source adaptor takes a lower bound value of the core voltage in each of the intervals as V_{bat_real}, and calculates the target charging voltage value V_out corresponding to the interval;

and

the DC-charging power source adaptor takes a higher bound value of the core voltage in each of the intervals as V_{bat_real}, and calculates the charging current maximum value I_max corresponding to the interval.

17. The rapid charging method according to claim 8, wherein:

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

the mobile terminal detecting that the voltage of the battery thereof is more than S2 instructs the DC-charging power source adaptor to output the constant charging voltage output by the DC-charging power source adaptor by default, to transmit the constant charging voltage to the power source managing chip in the mobile terminal to start the power source managing chip to charge the battery at the constant voltage.

18. The rapid charging method according to claim 9, wherein:

the mobile terminal detecting that the voltage of the battery thereof is less than S1 instructs the DC-charging power source adaptor to output constant charging voltage output by the DC-charging power source adaptor by default, to transmit the constant charging voltage to a power source managing chip in the mobile terminal to start the power source managing chip to precharge the battery at small current; and

the mobile terminal detecting that the voltage of the battery thereof is more than S2 instructs the DC-charging power source adaptor to output the constant charging voltage output by the DC-charging power source adaptor by default, to transmit the constant charging voltage to the power source managing chip in the mobile terminal to start the power source managing chip to charge the battery at the constant voltage.

19. The rapid charging method according to claim 10, wherein:

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

the mobile terminal detecting that the voltage of the battery thereof is more than S2 instructs the DC-charging power source adaptor to output the constant charging voltage output by the DC-charging power source adaptor by default, to transmit the constant charging voltage to the power source managing chip in the mobile terminal to start the power source managing chip to charge the battery at the constant voltage.

20. The rapid charging method according to claim 11, wherein:

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

the mobile terminal detecting that the voltage of the battery thereof is more than S2 instructs the DC-charging power source adaptor to output the constant charging voltage output by the DC-charging power source adaptor by default, to transmit the constant charging voltage to the power source managing chip in the mobile terminal to start the power source managing chip to charge the battery at the constant voltage.