USB CHARGER, MOBILE TERMINAL AND CHARGING METHOD THEREOF

• US 20160064978A1
• Filed: 05/22/2015
• Published: 03/03/2016
• Est. Priority Date: 08/29/2014
• Status: Active Grant

• Current Assignee: Spreadtrum Communications USA
• Original Assignee: Spreadtrum Communications USA
• Inventors: LEI, Peng, CHEN, Liangjin, LIANG, Wangping, LUAN, Guobing, ZHANG, Mingwei, ZHNAG, Fuqiang
• Granted Patent: US 9,923,396 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

Abstract

A USB charger, a mobile terminal, and a charging method are provided. The USB charger for charging a mobile terminal, includes a first logic control unit through which bidirectional communication is established between the USB charger and the mobile terminal, wherein the first logic control unit is configured to: send, to the mobile terminal, a first signal which indicates a maximum output capability of the USB charger; receive, from the mobile terminal, a second signal which indicates magnitude of a voltage requested by the mobile terminal; adjust a voltage output from the USB charger to be consistent with the voltage requested by the mobile terminal; and transmit a clock signal between the mobile terminal. Accordingly, the USB charger and the mobile terminal can communicate through two single signal wires by way of pulse signals. Thus, the mobile terminal is charged in a fast, safe, and simply way.

Claims

1. A USB charger adapted to charge a mobile terminal, comprising a first logic control unit through which bidirectional communication is established between the USB charger and the mobile terminal, wherein the first logic control unit is configured to:

send, to the mobile terminal, a first signal which indicates a maximum output capability of the USB charger;

receive, from the mobile terminal, a second signal which indicates magnitude of a voltage requested by the mobile terminal;

adjust a voltage output from the USB charger to be consistent with the voltage requested by the mobile terminal; and

transmit a clock signal between the USB charger and the mobile terminal.

2. The USB charger according to claim 1, wherein the voltage requested by the mobile terminal is determined based on the maximum output capability of the USB charger and a maximum load capability of the mobile terminal.

3. The USB charger according to claim 1, wherein the bidirectional communication is established through two signal wires, wherein one of the two signal wires is used to transmit the first signal and the second signal, while another one of the two signal wires is used to transmit the clock signal.

4. The USB charger according to claim 3, wherein the two signal wires are a signal wire D+ and a signal wire D−

.

5. The USB charger according to claim 4, wherein the signal wire D+ and the signal wire D−

are disconnected with each other, when the USB charger communicates with the mobile terminal.

6. The USB charger according to claim 3, wherein the first logic control unit comprises:

a first logic control circuit, a first switch transistor, and a first comparator, wherein the first logic control circuit is configured to;

send the first signal to the mobile terminal through the first switch transistor, receive and parse the second signal through the first comparator; and

transmit the clock signal through one of the two signal wires.

7. The USB charger according to claim 1, wherein the first signal and the second signal are pulse signals.

19. A method of charging a mobile terminal by a USB charger according to claim 1, comprising:

receiving a handshake request signal from the mobile terminal;

sending, to the mobile terminal, a first signal which comprises a maximum output capability of the USB charger;

receiving, from the mobile terminal, a second signal which indicates magnitude of a voltage requested by the mobile terminal; and

adjusting a voltage output from the USB charger to be consistent with the voltage requested by the mobile terminal.

20. The method according to claim 19, further comprising:

charging the mobile terminal with a regular voltage, when the handshake request signal received is unable to be parsed by the USB charger.

21. The method according to claim 19, further comprising:

charging the mobile terminal with a regular voltage, when the USB charger is disconnected with the mobile terminal.

22. The method according to claim 19, wherein the first signal, the second signal and the handshake request signal are pulse signals.

8. A mobile terminal, comprising a second logic control unit through which bidirectional communication is established between the mobile terminal and a USB charger, wherein the second logic control unit is configured to:

receive, from the USB charger, a first signal which indicates a maximum output capability of the USB charger;

send, to the USB charger, a second signal which indicates magnitude of a voltage requested by the mobile terminal;

adjust a charging setting, when a voltage output from the USB charger is consistent with the voltage requested by the mobile terminal; and

transmit a clock signal between the USB charger and the mobile terminal.

9. The mobile terminal according to claim 8, wherein the voltage requested by the mobile terminal is determined based on the maximum output capability of the USB charger and a maximum load capability of the mobile terminal.

10. The mobile terminal according to claim 8, wherein the bidirectional communication is established through two signal wires, wherein one of the two signal wires is adapted to transmit the first signal and the second signal, while another one of the two signal wires is adapted to transmit the clock signal.

11. The USB charger according to claim 10, wherein the two signal wires are a signal wire D+ and a signal wire D−

.

12. The mobile terminal according to claim 10, wherein the second logic control unit comprises:

a second logic control circuit, a second switch transistor, and a second comparator, wherein the second logic control circuit is configured to;

send the second signal to the USB charger through the second switch transistor;

receive the first signal from the USB charger through the second comparator; and

transmit the clock signal through one of the two signal wires.

13. The mobile terminal according to claim 8, wherein the first signal and the second signal are pulse signals.

14. A method of charging a mobile terminal according to claim 8, comprising:

sending a handshake request signal to a USB charger;

receiving, from the USB charger, a first signal which comprises a maximum output capability of the USB charger;

sending, to the USB charger, a second signal which indicates magnitude of a voltage requested by the mobile terminal; and

adjusting a charging setting of the mobile terminal when a voltage output from the USB charger is consistent with the voltage requested by the mobile terminal.

15. The method according to claim 14, further comprising detecting a type of the USB charger.

16. The method according to claim 14, further comprising:

detecting a charging state of the mobile terminal; and

adjusting a charging current when the charging state is detected abnormal.

17. The method according to claim 14, wherein the first signal, the second signal and the handshake request signal are pulse signals.

18. The method according to claim 14, further comprising:

charging the mobile terminal with a regular voltage, when the first signal is not received from the USB charger.