Wireless power transmitter and wireless power receiver

摘要

An automatic tuning assist circuit is coupled in series with a transmission antenna. A first switch and a second switch are arranged in series between a first terminal and a second terminal of the automatic tuning assist circuit. Furthermore, a third switch and a fourth switch are arranged in series between the first terminal and the second terminal. A first auxiliary capacitor is arranged between a connection node that connects the first switch and the second switch and a connection node that connects the third switch and the fourth switch. A first control unit switches on and off the first switch through the fourth switch with the same frequency as that of the driving voltage, and with a given phase difference with respect to the driving voltage.

主权项

1. A wireless power transmitting apparatus configured to transmit an electric power signal comprising any one from among an electric field, a magnetic field, and an electromagnetic field to a wireless power receiving apparatus, the wireless power transmitting apparatus comprising:
a transmission antenna comprising a transmission coil; an automatic tuning assist circuit coupled with the transmission antenna; and a power supply configured to apply an AC driving voltage across a series circuit that comprises the transmission antenna and the automatic tuning assist circuit, wherein the automatic tuning assist circuit comprises:
a first terminal;a second terminal;a first switch and a second switch arranged in series between the first terminal and the second terminal;a third switch and a fourth switch sequentially arranged in series between the first terminal and the second terminal such that they are arranged on a path that is in parallel with the first switch and the second switch;a first auxiliary capacitor arranged between a connection node that connects the first switch and the second switch and a connection node that connects the third switch and the fourth switch; and a first control unit configured to switch on and off the first switch through the fourth switch in synchronization with the driving voltage, wherein the power supply comprises: a DC power supply; and a first high-side switch and a first low-side switch sequentially arranged in series between an output terminal of the DC power supply and a fixed voltage terminal, and wherein the transmission antenna and the automatic tuning assist circuit are coupled in series between a connection node that connects the first high-side switch and the first low-side switch and the fixed voltage terminal.