ELECTRIC POWER RECEIVING DEVICE, ELECTRIC POWER SENDING DEVICE, AND ELECTRIC POWER TRANSMISSION METHOD

Embodiments of this application provide a power receiving apparatus, a power sending apparatus, and a power transmission method. A battery and protection circuit module is configured to obtain battery impedance. A first microcontroller module is configured to send a driving signal to an impedance transformation module based on a preset optimal value of input impedance of the impedance transformation module and the battery impedance, to adjust a duty cycle of a driving signal in the impedance transformation module, to enable the impedance transformation module to output a target voltage. The duty cycle is a ratio of high-level duration of the driving signal in one cycle to one cycle. When the impedance transformation module outputs the target voltage, the input impedance is at an optimal value of the input impedance. In this application, load impedance of the power receiving apparatus can be controlled at an optimal value in real time, to optimize the efficiency of the power transmission apparatus in the entire transmission state.