Wireless power transmission system and power transmitter

摘要

A wireless power transmission system includes: a power transmitting section that converts DC energy input from a DC energy source into AC energy of a frequency f0; a transmitting antenna; and a receiving antenna. The power transmitting section includes: a class-E oscillator circuit including a switching element and a capacitor which are connected in parallel to the DC energy source, for converting the DC energy into the AC energy; and a switching control section that inputs a control signal for controlling a conduction state of the switching element to the switching element. The switching control section switches the switching element from a non-conductive state to a conductive state when a preset time period has elapsed or when a potential difference across the switching element takes a local minimum value after the switching element is switched from the conductive state to the non-conductive state.

主权项

1. A wireless power transmission system, comprising:
a power transmitting section configured to convert DC energy input from a DC energy source into AC energy of a frequency f0, the power transmitting section comprising:
a class-E oscillator circuit including a switching element and a capacitor which are connected in parallel to the DC energy source, the class-E oscillator circuit configured to convert the DC energy into the AC energy; anda switching control section configured to input a control signal for controlling a conduction state of the switching element to the switching element, and use the control signal to switch the switching element from a non-conductive state to a conductive state one of when a preset time period determined by a value of the frequency f0 has elapsed and when a potential difference across the switching element takes a local minimum value after the switching element is switched from the conductive state to the non-conductive state; a transmitting antenna configured to transmit the AC energy converted by the power transmitting section; a receiving antenna configured to receive and output at least part of the AC energy transmitted by the transmitting antenna, and an input control section configured to control a magnitude of the DC energy input to the power transmitting section in accordance with fluctuations in the AC energy output from the power transmitting section.