Charging method, mobile device, charging device, and charging system

1. A mobile device comprising:

a battery; and

a connector, wherein the connector comprises a charging pin and a ground pin; and

wherein when the charging pin establishes a connection to an output pin of a charging device by using a charging cable or a battery charging stand, the charging pin is configured to receive a first current signal transmitted by the output pin of the charging device, and transmit the first current signal to an anode pin of a battery, so as to charge the battery;

wherein the mobile device further comprises an analog switch,

wherein when the charging pin establishes the connection to the output pin of the charging device, the analog switch connects the anode pin of the battery to the charging pin, and

wherein the charging pin is configured to

receive the first current signal and

transmit the first current signal by using the analog switch, so as to charge the battery;

wherein the mobile device further comprises a charging circuit and a universal serial bus (USB) port;

wherein when the charging pin is disconnected from the output pin of the charging device, the analog switch is configured to

disconnect the anode pin of the battery from the charging pin, and

connect an output pin of the charging circuit to the anode pin of the battery; and

wherein an input pin of the charging circuit is connected to the USB port, and is configured to

receive a second current signal transmitted by the USB port, and

transmit the second current signal to the anode pin of the battery by using the output pin of the charging circuit and the analog switch, so as to charge the battery.

2. The mobile device according to claim 1 , wherein the connector is a multi-pin port, a multi-contact port, or a port multiplexed with the USB port by using the analog switch.

3. The mobile device according to claim 1 ,

wherein the mobile device further comprises a controller and a voltage converting circuit;

wherein one end of the voltage converting circuit is connected to the charging pin, and another end of the voltage converting circuit is connected to the controller; and

wherein the voltage converting circuit is configured to convert a voltage of the charging pin and then transmit a converted voltage to the controller when the charging pin establishes the connection to the output pin of the charging device.

4. The mobile device according to claim 3 , wherein the controller further comprises a bus port, and the connector further comprises a single-wire bus pin or a multi-wire bus pin; and

wherein the bus port is connected to the single-wire bus pin or the multi-wire bus pin of the connector by using a bus, and is configured to transmit bus data or a control signal generated by the controller, so that the charging device adjusts the output first current signal after receiving the bus data or the control signal.

5. The mobile device according to claim 1 , wherein the ground pin is connected to a first ground pin of the charging device by using the charging cable or the battery charging stand; and

wherein the ground pin of mobile device, a ground pin of the battery and a ground pin of the charging circuit are configured to be connected to each other when the charging pin establishes the connection.

6. A charging device comprising:

a switch charger module; and

a charging circuit,

wherein the charging circuit comprises an input pin and an output pin,

wherein the input pin is connected to an output pin of the switch charger module, and is configured to receive a first current signal transmitted by the output pin of the switch charger module, and

wherein the output pin establishes a connection to a charging pin of a mobile device by using a charging cable or a battery charging stand, so as to use the first current signal to charge a battery of the mobile device;

wherein the charging circuit further comprises a bus port, wherein the bus port is connected to a single-wire bus pin or a multi-wire bus pin of a connector in the mobile device by using a bus, and is configured to receive bus data or a control signal transmitted by the mobile device; and

wherein the charging circuit is further configured to adjust the first current signal according to the bus data or the control signal;

wherein the charging circuit further comprises a first ground pin and a second ground pin,

wherein the first ground pin is connected to a ground pin of the mobile device by using the charging cable or the battery charging stand, and

wherein the second ground pin is connected to a ground pin of the switch charger module.

7. The charging device according to claim 6 , wherein the charging circuit is a switch charging circuit or a linear charging circuit.

8. A charging method comprising:

receiving, by a charging pin of a connector, when the charging pin establishes a connection to an output pin of a charging device by using a charging cable or a battery charging stand, a first current signal transmitted by the output pin of the charging device; and

transmitting, by the charging pin, the first current signal to an anode pin of a battery, so as to charge the battery;

wherein after receiving the first current signal, and before transmitting the first current signal, connecting, by an analog switch, the anode pin of the battery to the charging pin;

when the charging pin is disconnected from the output pin of the charging device, disconnecting, by the analog switch, the anode pin of the battery from the charging pin, and connecting an output pin of a charging circuit to the anode pin of the battery;

receiving, by an input pin of the charging circuit, a second current signal by using a USB port; and

transmitting, by the input pin of the charging circuit, the second current signal to the anode pin of the battery by using the output pin of the charging circuit and the analog switch, so as to charge the battery.

9. The charging method according to claim 8 , wherein the method further comprises:

generating, by a controller, bus data, or a control signal; and

transmitting, by the controller, the bus data or the control signal to the charging device, so that the charging device adjusts the output first current signal.