POWER SOURCE ADAPTOR FOR CHARGING DIRECTLY

• US 20170040813A1
• Filed: 03/09/2016
• 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: XU, Liangliang, HU, Ermeng, DU, Wenjuan
• Granted Patent: US 10,044,204 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 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters

Abstract

The application discloses a power source adaptor for charging directly, where the power source adaptor for charging directly is timed to communicate wirelessly with a mobile terminal which is a charging object, to obtain a change in voltage of a battery in the mobile terminal, adjusts dynamically a volt value of charging voltage output by the power source adaptor for charging directly according to the varying voltage of the battery, and charges directly the battery in the mobile terminal using the charging voltage.

Claims

1. A power source adaptor for charging directly, comprising:

a charging interface configured to be externally connected with a mobile terminal, and comprising a power source pin and a ground pin;

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;

a wireless communication module configured to transmit and receive a wireless signal; and

a controlling unit, connected with the wireless communication module, configured to start the wireless communication module to wait for being connected wirelessly with the mobile terminal, after the AC to DC converting unit receives the AC input power source or the charging interface is connected with the mobile terminal; and

after they are connected successfully, to exchange data with the mobile terminal through the wireless communication module, and to adjust the charging voltage output by the AC to DC converting unit according to current voltage of a battery of the mobile terminal.

2. The power source adaptor for charging directly according to claim 1, wherein the wireless communication module is a Bluetooth module configured to feed the same Bluetooth match code back to the mobile terminal for matching, upon reception of a Bluetooth match code sent by the mobile terminal;

and after they are matched successfully, to receive a connection request sent by the mobile terminal, to be connected wirelessly with the mobile terminal, and to exchange data with the mobile terminal after they are connected successfully.

3. The power source adaptor for charging directly according to claim 1, wherein the controlling unit receives a target charging voltage value Vout sent by the mobile terminal through the wireless communication module, and adjusts the charging voltage output by the AC to DC converting unit to the target charging voltage value Vout according to the target charging voltage value Vout;

or

the controlling unit receives voltage of a battery sent by the mobile terminal through the wireless communication module, and if the voltage of the battery lies in a range delimited by preset direct charging thresholds, then the controlling unit searches a preset reference table using the voltage of the battery for a target charging voltage value Vout corresponding to the current voltage of the battery, feeds the target charging voltage value Vout to the mobile terminal, and adjusts the charging voltage output by the AC to DC converting unit to the target charging voltage value Vout;

or if the voltage of the battery falls out of the range delimited by the preset direct charging thresholds, then the controlling unit controls the AC to DC converting unit to output default constant charging voltage.

4. The power source adaptor for charging directly according to claim 3, wherein if the voltage of the battery lies in the range delimited by the preset direct charging thresholds, then the controlling unit receives a target charging current value Itarg, and a charging current maximum value Imax, sent by the mobile terminal through the wireless communication module, or searches the reference table for a target charging current value Itarg, and a charging current maximum value Imax, corresponding to the current voltage of the battery;

and

the controlling unit detects charging current Ichg output via the charging interface, and if Itarg−

Ie≦

Ichg<

Itarg, then the controlling unit controls the AC to DC converting unit to adjust up progressively the charging voltage output by the AC to DC converting unit by an amount of Δ

V, so that the actual charging current Ichg output via the charging interface approaches the target charging current value Itarg;

or if the absolute value of the difference between Ichg and Itarg is more than Ie or Ichg is more than Imax, then the controlling unit stops the charging voltage from being output to the charging interface;

wherein Ie represents a controllable range of the difference between the actual charging current value of the power source adaptor for charging directly and the target charging current value.

5. The power source adaptor for charging directly according to claim 1, wherein the AC to DC converting unit comprises a rectifying circuit, a transformer unit, a synchronous rectification controller, and a PWM controller;

and the controlling unit comprises a controller and a digital potentiometer, wherein;

the rectifying circuit rectifies the AC input power source into a DC power source, and outputs the DC power source to the transformer unit for transformation into the charging voltage;

the controller is connected with the wireless communication module, communicates wirelessly with the external mobile terminal through the wireless communication module, and generates from the charging voltage required for the mobile terminal and sends a voltage adjusting instruction to the digital potentiometer to change a resistance value of a valid resistor of the digital potentiometer;

a resistor body of the digital potentiometer, connected in series with current-limiting resistor is connected between an anode of a secondary coil of the transformer unit and the ground, and a central tap of the resistor body is connected with a reference voltage pin of the synchronous rectification controller; and

the synchronous rectification controller adjusts a duty ratio of a PWM signal output by the PWM controller according to the varying resistance value of the valid resistor of the digital potentiometer, and controls a switching timing of the transformer unit using the PWM signal to adjust a volt value of the charging voltage output by the transformer unit.

6. The power source adaptor for charging directly according to claim 2, wherein the AC to DC converting unit comprises a rectifying circuit, a transformer unit, a synchronous rectification controller, and a PWM controller;

and the controlling unit comprises a controller and a digital potentiometer, wherein;

the rectifying circuit rectifies the AC input power source into a DC power source, and outputs the DC power source to the transformer unit for transformation into the charging voltage;

the controller is connected with the wireless communication module, communicates wirelessly with the external mobile terminal through the wireless communication module, and generates from the charging voltage required for the mobile terminal and sends a voltage adjusting instruction to the digital potentiometer to change a resistance value of a valid resistor of the digital potentiometer;

a resistor body of the digital potentiometer, connected in series with current-limiting resistor is connected between an anode of a secondary coil of the transformer unit and the ground, and an central tap of the resistor body is connected with a reference voltage pin of the synchronous rectification controller; and

the synchronous rectification controller adjusts a duty ratio of a PWM signal output by the PWM controller according to the varying resistance value of the valid resistor of the digital potentiometer, and controls a switching timing of the transformer unit using the PWM signal to adjust a volt value of the charging voltage output by the transformer unit.

7. The power source adaptor for charging directly according to claim 3, wherein the AC to DC converting unit comprises a rectifying circuit, a transformer unit, a synchronous rectification controller, and a PWM controller;

and the controlling unit comprises a controller and a digital potentiometer, wherein;

the rectifying circuit rectifies the AC input power source into a DC power source, and outputs the DC power source to the transformer unit for transformation into the charging voltage;

the controller is connected with the wireless communication module, communicates wirelessly with the external mobile terminal through the wireless communication module, and generates from the charging voltage required for the mobile terminal and sends a voltage adjusting instruction to the digital potentiometer to change a resistance value of a valid resistor of the digital potentiometer;

a resistor body of the digital potentiometer, connected in series with current-limiting resistor is connected between an anode of a secondary coil of the transformer unit and the ground, and an central tap of the resistor body is connected with a reference voltage pin of the synchronous rectification controller; and

the synchronous rectification controller adjusts a duty ratio of a PWM signal output by the PWM controller according to the varying resistance value of the valid resistor of the digital potentiometer, and controls a switching timing of the transformer unit using the PWM signal to adjust a volt value of the charging voltage output by the transformer unit.

8. The power source adaptor for charging directly according to claim 4, wherein the AC to DC converting unit comprises a rectifying circuit, a transformer unit, a synchronous rectification controller, and a PWM controller;

and the controlling unit comprises a controller and a digital potentiometer, wherein;

the rectifying circuit rectifies the AC input power source into a DC power source, and outputs the DC power source to the transformer unit for transformation into the charging voltage;

the controller is connected with the wireless communication module, communicates wirelessly with the external mobile terminal through the wireless communication module, and generates from the charging voltage required for the mobile terminal and sends a voltage adjusting instruction to the digital potentiometer to change a resistance value of a valid resistor of the digital potentiometer;

a resistor body of the digital potentiometer, connected in series with current-limiting resistor is connected between an anode of a secondary coil of the transformer unit and the ground, and an central tap of the resistor body is connected with a reference voltage pin of the synchronous rectification controller; and

the synchronous rectification controller adjusts a duty ratio of a PWM signal output by the PWM controller according to the varying resistance value of the valid resistor of the digital potentiometer, and controls a switching timing of the transformer unit using the PWM signal to adjust a volt value of the charging voltage output by the transformer unit.

9. The power source adaptor according for charging directly to claim 5, wherein the AC to DC converting unit further comprises:

an optical coupler, connected with the synchronous rectification controller and the PWM controller, configured to optic-electrically isolate a signal output by the synchronous rectification controller; and

a power MOS transistor, connected between a cathode of the secondary coil of the transformer unit and the ground pin of the charging interface, configured to be controlled by the synchronous rectification controller to be switched on and off to rectify the charging voltage output by the transformer unit.

10. The power source adaptor for charging directly according to claim 5, wherein the controlling unit further comprises:

a current monitoring unit configured to monitor in real time charging current Ichg output via the charging interface, and to feed the charging current back to the controller; and

a switch circuit, connected between the AC to DC converting unit and the charging interface, configured to be controlled by the controller upon detecting that the charging current Ichg is abnormal, to disconnect a charging voltage transmission line between the AC to DC converting unit and the charging interface to stop the charging voltage from being output to the outside.

11. The power source adaptor for charging directly according to claim 10, wherein the current monitoring unit comprises:

a current sampling resistor connected in series in the transmission line of the charging voltage; and

a current monitoring chip, connected in parallel with the current sampling resistor, configured to monitor a difference in voltage across the current sampling resistor, and to amplify the difference in voltage and then output a sample voltage for transmission to the controller.

12. The power source adaptor for charging directly according to claim 11, wherein the current monitoring unit further comprises:

a bleeder circuit, connected with the current monitoring chip, configured to divide the sample voltage output by the current monitoring chip to adjust the sample voltage in an interface voltage range acceptable to the controller, and to transmit the sample voltage to an ADC interface of the controller to detect a current value output via the charging interface.

13. The power source adaptor for charging directly according to claim 10, wherein the switch circuit comprises:

a switch transistor supporting large current passing, switched on and connected in the transmission line of the charging voltage; and

a boosting circuit, connected with the controller, configured, upon reception of a valid enable signal output by the controller, to output a higher switch voltage than a volt value of the charging voltage, and to transmit the switch voltage to a control pole of the switch transistor to control the switch transistor to connect the transmission line of the charging voltage, wherein upon detecting that a current value output via the charging interface exceeds an allowable current range, the controller outputs an invalid enable signal to the boosting circuit, controls the boosting circuit to stop the switch voltage from being output, and further controls the switch transistor to disconnect the transmission line of the charging voltage to stop the charging voltage from being output to the outside.

14. A mobile terminal, comprising:

a battery configured to store electrical energy;

a USB interface configured to be engaged with an external device;

a wireless communication module configured to transmit and receive a wireless signal;

a microprocessor configured, upon detecting an external device being inserted into the USB interface, to start the wireless communication module to search for devices which can communicate wirelessly therewith, if the devices comprise the external device connected with the USB interface, to determine that the external device is a power source adaptor for charging directly, and to be connected wirelessly with the power source adaptor for charging directly, if they are connected successfully, to exchange data with the power source adaptor for charging directly through the wireless communication module, to detect voltage of the battery, and if the voltage of the battery lies in a range delimited by preset direct charging threshold, to control charging voltage output by the power source adaptor for charging directly to charge the battery directly, and to determine from the current voltage of the battery the value of the charging voltage output by the power source adaptor for charging directly,

wherein the microprocessor is further configured to output a switch control signal; and

a direct charging switch configured to control the mobile terminal to be switched between a charging mode in which the battery is charged through the power source managing chip, and a charging mode in which the battery is charged through the direct charging switch, in response to the switch control signal output by the microprocessor.