Richtek Technology Corporation

Wei-Shuo Wu

Fu-Chi Lin

A wireless power transmitter circuit includes: an inverter circuit including plural switches coupled to a resonant transmitter circuit; and a transmitter controller circuit for generating a PWM control signal, to control the plural switches, thus generating a wireless transmission power via the resonant transmitter circuit in a power supply procedure, so that a wireless power supply is accordingly provided to a wireless power receiver circuit. In a groping procedure, transmitter controller circuit controls the plural switches to generate a wireless test power via the resonant transmitter circuit based on an operation frequency. The groping procedure includes: measuring a peak of a transmission signal corresponding to the wireless test power; determining, according to the peak of the transmission signal, whether a foreign object exists and/or whether the wireless power receiver circuit is present. When it is determined that the wireless power receiver circuit is present, the power supply procedure is performed.

Wireless power transmitter circuit and method capable of detecting wireless power receiver and foreign object

A wireless charging system includes a wireless power transmitter and N wireless power receivers. The wireless power transmitter includes a power input terminal for receiving an input power, and M transmission modules. Each transmission module includes a power controller, a power management unit, a bridge driver, and a transmission unit. The N wireless power receivers are for receiving N wireless power signals from N transmission units of N transmission modules respectively, and wirelessly transmitting the N communication signals to the N transmission units of the N transmission modules respectively. The M power management units of the M transmission modules are coupled to each other and transmit control signals for handshaking communication.

Growing community of inventors

Kaohsiung, Taiwan

Wei-Shuo Wu