A power supply generating circuit, comprising: a driving voltage generating circuit, configured to generate a driving voltage signal; and a pulse generating circuit, comprising a first input end, a second input end, a first output end, an energy storage end, an inductor, a second switch and a third switch, wherein the pulse generating circuit is configured to receive the driving voltage signal through the first input end and receive a communication signal through the second input end, the first output end is connected to the energy storage end through the inductor and the second switch, a first port is disposed between the inductor and the second switch, the first port is connected to a device ground through the third switch, the inductor is connected between the first output end and the first port, the second switch is connected between the first port and the energy storage end; wherein at a positive phase stage of the communication signal, the pulse generating circuit is configured to output only the driving voltage signal through the first output end; and at a negative phase stage of the communication signal, the first output end is configured not to output the driving voltage signal, and the pulse generating circuit is configured to output a charge to the energy storage end, wherein the charge is input from the first output end; the second switch is configured to be turned off at an initial time of the negative phase stage of the communication signal and turned on when a voltage of the first output end decreases to a voltage of the device ground, the third switch is configured to be turned on at the initial time of the negative phase stage of the communication signal and turned off when the voltage of the first output end decreases to the voltage of the device ground. a driving voltage generating circuit, configured to generate a driving voltage signal; and a pulse generating circuit, comprising a first input end, a second input end, a first output end, an energy storage end, an inductor, a second switch and a third switch, wherein the pulse generating circuit is configured to receive the driving voltage signal through the first input end and receive a communication signal through the second input end, the first output end is connected to the energy storage end through the inductor and the second switch, a first port is disposed between the inductor and the second switch, the first port is connected to a device ground through the third switch, the inductor is connected between the first output end and the first port, the second switch is connected between the first port and the energy storage end; wherein at a positive phase stage of the communication signal, the pulse generating circuit is configured to output only the driving voltage signal through the first output end; and at a negative phase stage of the communication signal, the first output end is configured not to output the driving voltage signal, and the pulse generating circuit is configured to output a charge to the energy storage end, wherein the charge is input from the first output end; the second switch is configured to be turned off at an initial time of the negative phase stage of the communication signal and turned on when a voltage of the first output end decreases to a voltage of the device ground, the third switch is configured to be turned on at the initial time of the negative phase stage of the communication signal and turned off when the voltage of the first output end decreases to the voltage of the device ground.