WIRELESS POWER TRANSMISSION SYSTEM

摘要

A wireless power transmission system in which power is transmitted from a power transmitting apparatus to a power receiving apparatus that includes: a diode bridge formed of first and second diodes whose anodes are connected to each other, and third and fourth diodes whose cathodes are connected to each other; series circuits formed of semiconductor switching devices and capacitors respectively connected in parallel with the first and second diodes, and a control circuit that inputs a modulation signal to the gates of the semiconductor switching devices. The power transmitting apparatus includes a controller that reads the modulation signal on a basis of a change in a DC current input at an input terminal. The a wireless power transmission system can transmit data from the power receiving apparatus to the power transmitting apparatus without interrupting power transmission, reducing output voltage variations, and suppressing degradation of power transmission characteristics.

主权项

1. A wireless power transmission system comprising:
a power transmitting apparatus including an active electrode and a passive electrode; and a power receiving apparatus that includes an active electrode and a passive electrode and that is configured to receive power from an electric field generated between the respective active electrodes when the power receiving apparatus is positioned on the power transmitting apparatus, the power receiving apparatus comprising:
a diode bridge including first and second diodes with respective anodes that are coupled to each other, and third and fourth diodes with respective cathodes that are coupled to each other;a pair of first series circuits, each having a semiconductor switching device and a capacitor, with each first series circuit coupled in parallel with the first and second diodes, respectively;
a control circuit configured to output a modulation signal to respective control terminals of the semiconductor switching devices to control an operating state of the pair of first series circuits, andwherein a load impedance detected by the power transmitting apparatus is based at least partially on the operating state of the pair of first series circuits.