Power source adaptor for charging directly

Patent metadata

Field	Value
Publication number	US-10044204-B2
Application number	US-201615064835-A
Country	US
Kind code	B2
Filing date	Mar 9, 2016
Priority date	Aug 5, 2015
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

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.

First claim

The invention claimed is:

1. A power source adaptor for directly charging a battery in a mobile terminal, the power source adaptor comprising:
a charging interface configured to externally connect with a mobile terminal, and comprising a power source pin and a ground pin;
an AC to DC converter configured to convert an AC input power source into a charging voltage required by the mobile terminal, and output the charging voltage to the mobile terminal via the charging interface;
a wireless communication module configured to wirelessly connect with the mobile terminal to transmit and receive one or more wireless signals; and
a controlling unit connected with the wireless communication module, the controlling unit configured to start the wireless communication module and wait for it to be 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 the wireless communication module and the mobile terminal are connected, exchange data with the mobile terminal through the wireless communication module, and adjust the charging voltage output by the AC to DC converter unit according to a current voltage of a battery in the mobile terminal.

2. The power source adaptor according to claim 1 , wherein the wireless communication module is a Bluetooth module configured to, upon reception of a Bluetooth match code sent by the mobile terminal, feed the same Bluetooth match code back to the mobile terminal for matching; and after they are matched, receive a connection request from the mobile terminal to wirelessly connect with the mobile terminal, and exchange data with the mobile terminal after they are connected.

3. The power source adaptor according to claim 1 , wherein:
the controlling unit is configured to receive a target charging voltage value from the mobile terminal through the wireless communication module, and adjust the charging voltage output by the AC to DC converter to the target charging voltage value according to the target charging voltage value; or
the controlling unit is configured to receive a voltage of the battery from 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, search a preset reference table using the voltage of the battery a target charging voltage value corresponding to the current voltage of the battery, feed the target charging voltage value to the mobile terminal, and adjust the charging voltage output by the AC to DC converter the target charging voltage value; or if the voltage of the battery falls out of the range delimited by the preset direct charging thresholds, control the AC to DC converter to output a default constant charging voltage.

4. The power source adaptor according to claim 3 , wherein if the voltage of the battery lies in the range delimited by the preset direct charging thresholds, the controlling unit is configured to receive a target charging current value Itarg and a charging current maximum value Imax from the mobile terminal through the wireless communication module, or search the reference table for the target charging current value Itarg and the charging current maximum value Imax corresponding to the current voltage of the battery;
wherein the controlling unit is configured to detect a charging current Ichg output via the charging interface, and if Itarg−Ie≤Ichg<Itarg, control the AC to DC converter to progressively increase the charging voltage output by the AC to DC converter by a defined voltage ΔV, so that the 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, stop the charging voltage from being output to the charging interface; and
wherein Ie represents a controllable range of the difference between the charging current value Itarg and the target charging current value Itarg.

5. The power source adaptor according to claim 1 , wherein the AC to DC converter comprises a rectifying circuit, a transformer, a synchronous rectification controller, and a PWM controller, wherein the controlling unit comprises a controller and a digital potentiometer, wherein the rectifying circuit is configured to rectify the AC input power source into a DC power source and output the DC power source to the transformer for transformation into the charging voltage, wherein the controller is connected with the wireless communication module, wherein the controller is configured to wirelessly communicates with the mobile terminal through the wireless communication module, generate a voltage adjusting instruction from the charging voltage and sends the voltage adjusting instruction to the digital potentiometer to change a resistance value of a resistor of the digital potentiometer, wherein the digital potentiometer includes a resistor body connected in series with a current-limiting resistor, wherein the current-limiting resistor is connected between an anode of a secondary coil of the transformer and ground, wherein a central tap of the resistor body is connected with a reference voltage pin of the synchronous rectification controller, and wherein the synchronous rectification controller is configured to adjust a duty ratio of a PWM signal output by the PWM controller according to the varying resistance value of the resistor of the digital potentiometer and control a switching time of the transformer based on the PWM signal to adjust a value of the charging voltage output by the transformer.

6. The power source adaptor according to claim 2 , wherein the AC to DC converter comprises a rectifying circuit, a transformer, a synchronous rectification controller, and a PWM controller, wherein the controlling unit comprises a controller and a digital potentiometer, wherein the rectifying circuit is configured to rectify the AC input power source into a DC power source and output the DC power source to the transformer for transformation into the charging voltage, wherein the controller is connected with the wireless communication module, wherein the controller is configured to wirelessly communicates with the mobile terminal through the wireless communication module, generate a voltage adjusting instruction from the charging voltage and send the voltage adjusting instruction to the digital potentiometer to change a resistance value of a resistor of the digital potentiometer, wherein the digital potentiometer includes a resistor body connected in series with a current-limiting resistor, wherein the current-limiting resistor is connected between an anode of a secondary coil of the transformer and ground, wherein a central tap of the resistor body is connected with a reference voltage pin of the synchronous rectification controller, and wherein the synchronous rectification controller is configured to adjust a duty ratio of a PWM signal output by the PWM controller according to the varying resistance value of the resistor of the digital potentiometer and control a switching time of the transformer based on the PWM signal to adjust a value of the charging voltage output by the transformer.

7. The power source adaptor according to claim 3 , wherein the AC to DC converter comprises a rectifying circuit, a transformer, a synchronous rectification controller, and a PWM controller, wherein the controlling unit comprises a controller and a digital potentiometer, wherein the rectifying circuit is configured to rectify the AC input power source into a DC power source and output the DC power source to the transformer for transformation into the charging voltage, wherein the controller is con

Assignees

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

Inventors

• Hu Ermeng
• Du Wenjuan
• Xu Liangliang

Classifications

• H02J7/42

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

• H02J7/731 Primary

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

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• H02J7/022

  Electricity · mapped topic

• H02J7/0044 Primary

  Electricity · mapped topic