DC-charging power source adaptor and mobile terminal

Patent metadata

Field	Value
Publication number	US-10050466-B2
Application number	US-201615051851-A
Country	US
Kind code	B2
Filing date	Feb 24, 2016
Priority date	Aug 5, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

This disclosure relates to a DC-charging power source adaptor including a charging interface, an AC to DC converting unit, and a controlling unit; and the DC-charging power source adaptor is timed to communicate with a mobile terminal which is a charging object, to acquire a change in voltage of a battery in the mobile terminal and further adjust dynamically a volt value of charging voltage output by the DC-charging power source adaptor according to the change in voltage of the battery, and DC-charges the battery in the mobile terminal using the charging voltage.

First claim

The invention claimed is:

1. A DC-charging power source adaptor comprising:
a charging interface configured to be connected with a mobile terminal having a battery, the charging interface comprising a power source pin, a ground pin, and two communication pins shorted by default;
an AC to DC converting unit configured to convert an external AC input power source into a charging voltage required by the mobile terminal, and output the charging voltage via the charging interface; and
a controlling unit in connection with the charging interface, and configured to disconnect the two communication pins of the charging interfaces from each other upon detecting that the charging interface is connected with the mobile terminal, and communicate with the mobile terminal through the two communication pins to adjust the charging voltage output by the AC to DC converting unit, and wherein the controlling unit is further configured to:
receive a target charging voltage value sent by the mobile terminal and adjust the charging voltage output by the AC to DC converting unit according to the target charging voltage value to reach the target charging voltage value; or
receive a voltage of the battery sent by the mobile terminal, if the voltage of the battery is in a range delimited by preset DC-charging thresholds, search a preset reference table using the voltage of the battery as a target charging voltage value corresponding to the current voltage of the battery, feedback the target charging voltage value to the mobile terminal, and adjust the charging voltage output by the AC to DC converting unit to the target charging voltage value, and if the voltage of the battery is out of the range delimited by the preset DC-charging thresholds, control the AC to DC converting unit to output constant charging voltage.

2. The DC-charging power source adaptor according to claim 1 , wherein the controlling unit includes UART interfaces configured to receive an input and connect with the two communication pins, and wherein after the UART interfaces receive a specific pulse waveform sent by the mobile terminal, the controlling unit is configured to disconnect the two communication pins of the charging interface from each other, configure the UART interfaces to function as a communication interface, and conduct UART communication information with the mobile terminal.

3. The DC-charging power source adaptor according to claim 1 , wherein the controlling unit is configured to:
disconnect the two communication pins from each other after a connection between the charging interface and the mobile terminal is detected and a preset period of time is delayed; and
send a UART communication command on its own initiative to the mobile terminal to exchange a handshake instruction therewith or wait for reception of a UART communication command sent by the mobile terminal, and feedback a response command to complete a handshake upon reception of the UART communication command; and
wherein the preset period of time is determined as a function of a period of time when the mobile terminal detects an external device being inserted to when the mobile terminal detects differential data pins of the mobile terminal are shorted.

4. The DC-charging power source adaptor according to claim 1 , wherein:
when the voltage of the battery is in the range delimited by the preset DC-charging thresholds, the controlling unit is configured to receive a target charging current value I targ and a charging current maximum value I max sent by the mobile terminal, or search the reference table for a target charging current value I targ and a charging current maximum value I max corresponding to the current voltage of the battery;
the controlling unit is further configured to detect a charging current I chg output via the charging interface, and if I targ −I e ≤I chg <I targ , control the AC to DC converting unit to progressively increase the charging voltage output by the AC to DC converting unit by an amount of ΔV, so that the charging current I chg output via the charging interface approaches the target charging current value I targ , or if the absolute value of the difference between the charging current I chg and the target charging current value I targ is more than I e or the charging current I chg is more than the charging current maximum value I max , stop the charging voltage from being output to the charging interface; and
I e represents a controllable range of the difference between a value of the charging current I chg and the target charging current value I targ .

5. The DC-charging power source adaptor according to claim 1 , further comprising two signal lines connected with the two communication pins and a switch connected across the two signal lines, wherein the control unit is configured to control the switch to close or open to short or disconnect the two communication pins.

6. The DC-charging power source adaptor according to claim 1 , wherein the AC to DC converting unit includes a rectifying circuit, a transformer, a synchronous rectification controller, and a PWM controller, wherein the controlling unit includes a controller and a digital potentiometer, wherein the rectifying circuit is configured to rectify an 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 of the controlling unit is configured to conduct UART communication with the mobile terminal through UART interfaces of the controller, generate a voltage adjusting instruction according to the charging voltage required by the mobile terminal and send the voltage adjusting instruction to the digital potentiometer to change a resistance value of a valid resistor of the digital potentiometer, wherein the digital potentiometer includes a resistor body connected in series with a current-limiting resistor and between an anode of a secondary coil of the transformer and ground, wherein the resistor body includes an intermediate tap 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 valid resistor of the digital potentiometer, and control a switching timing of the transformer using the PWM signal to adjust a volt value of the charging voltage output by the transformer.

7. The DC-charging power source adaptor according to claim 2 , wherein the AC to DC converting unit includes a rectifying circuit, a transformer, a synchronous rectification controller, and a PWM controller, wherein the controlling unit includes a controller and a digital potentiometer, wherein the rectifying circuit is configured to rectify an AC input power source into a DC power source, and output the DC power source to the transformer unit for transformation into the charging voltage, wherein the controller of the controlling unit is configured to conduct UART communication with the mobile terminal through the UART interfaces of the controller, generate a voltage adjusting instruction according to the charging voltage required by the mobile terminal and send the voltage adjusting instruction to the digital potentiometer to change a resistance value of a valid resistor of the digital potentiometer, wherein the digital potentiometer includes a resistor body connected in series with a current-limiting resistor and between an anode of a secondary coil of the transformer and ground, wherein the resistor body includes an intermediate tap connected with a reference voltage pin of the synchronous rectification controller, and wherein the synchronous rectification controller is configured to

Assignees

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

Inventors

• Hu Ermeng
• Yin Rongyi
• Du Wenjuan

Classifications

• 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

• H02J7/00

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

• H02J2007/0062

  Electricity · mapped topic