Power supply device, power receiving device, and charging method

A vehicle comprising:

• a transmission characteristic circuit and a power receiving interface, wherein an input of the transmission characteristic circuit and an output of the transmission characteristic circuit are separately coupled to the power receiving interface, and the vehicle is configured to:
• receive a first electrical signal from a power supply through the power receiving interface at the input of the transmission characteristic circuit, and transmit the first electrical signal by using the transmission characteristic circuit;
• send a second electrical signal to the power supply through the power receiving interface at the output of the transmission characteristic circuit, wherein the second electrical signal is the first electrical signal transmitted through the transmission characteristic circuit, and a transmission characteristic of the transmission characteristic circuit is used to change a characteristic electrical signal parameter of the first electrical signal to obtain the second electrical signal;
• and
• receive a power supply signal from the power supply through the power receiving interface.

A network, comprising:

• a power supply and a vehicle, wherein the power supply comprises a power supply interface, the vehicle comprises a power receiving interface and a transmission characteristic circuit, the power supply interface is coupled to an input and an output of the transmission characteristic circuit through the power receiving interface, and the power supply is configured to:
• send a first electrical signal to the input of the transmission characteristic circuit through the power supply interface in response to the power receiving interface being coupled to the power supply interface;
• receive a second electrical signal from the output of the transmission characteristic circuit through the power supply interface, wherein the second electrical signal is the first electrical signal transmitted through the transmission characteristic circuit;
• and
• responsive to a characteristic electrical signal parameter of the second electrical signal is within a preset range, send a power supply signal to the vehicle through the power supply interface, wherein the characteristic electrical signal parameter is affected by a transmission characteristic of the transmission characteristic circuit.