A power converter, wherein one side of the power converter is connected to a power grid equipment, the other side of the power converter is connected to an energy storage device located inside a vehicle, the power grid equipment supplies power to the energy storage device through the power converter, the power converter comprising: a control circuit; a power conversion circuit; a first converter; and a second converter, wherein: the control circuit is electrically connected with the second converter, and the second converter is electrically connected with the power grid equipment; the control circuit is configured to receive a second electric energy supplied to the control circuit from a power grid equipment through the second converter, and output a fourth control signal to control the power conversion circuit to work after being powered on; the power conversion circuit is configured to receive the fourth control signal and perform power conversion between the energy storage device and the power grid equipment according to the fourth control signal; the first converter is configured to be in a working state after taking electricity from the power conversion circuit, down-convert a voltage corresponding to an electric energy output from the power conversion circuit into a voltage corresponding to a ninth electric energy in response to a fifth control signal output vofrom ltage the control circuit, and supply power to the control circuit with the ninth electric energy; and the control circuit is further configured to select the second electrical energy or the ninth electrical energy as the power supply of the control circuit based on a competitive power supply mode. a control circuit; a power conversion circuit; a first converter; and a second converter, wherein: the control circuit is electrically connected with the second converter, and the second converter is electrically connected with the power grid equipment; the control circuit is configured to receive a second electric energy supplied to the control circuit from a power grid equipment through the second converter, and output a fourth control signal to control the power conversion circuit to work after being powered on; the power conversion circuit is configured to receive the fourth control signal and perform power conversion between the energy storage device and the power grid equipment according to the fourth control signal; the first converter is configured to be in a working state after taking electricity from the power conversion circuit, down-convert a voltage corresponding to an electric energy output from the power conversion circuit into a voltage corresponding to a ninth electric energy in response to a fifth control signal output vofrom ltage the control circuit, and supply power to the control circuit with the ninth electric energy; and the control circuit is further configured to select the second electrical energy or the ninth electrical energy as the power supply of the control circuit based on a competitive power supply mode. the control circuit is electrically connected with the second converter, and the second converter is electrically connected with the power grid equipment; the control circuit is configured to receive a second electric energy supplied to the control circuit from a power grid equipment through the second converter, and output a fourth control signal to control the power conversion circuit to work after being powered on; the power conversion circuit is configured to receive the fourth control signal and perform power conversion between the energy storage device and the power grid equipment according to the fourth control signal; the first converter is configured to be in a working state after taking electricity from the power conversion circuit, down-convert a voltage corresponding to an electric energy output from the power conversion circuit into a voltage corresponding to a ninth electric energy in response to a fifth control signal output vofrom ltage the control circuit, and supply power to the control circuit with the ninth electric energy; and the control circuit is further configured to select the second electrical energy or the ninth electrical energy as the power supply of the control circuit based on a competitive power supply mode.