WIRELESS CHARGING CIRCUIT, WIRELESS CHARGING SYSTEM AND SEMICONDUCTOR DEVICE

摘要

To satisfy the NFC communication standard in wireless charging with a shared antenna, used for NFC communication.;A power supply unit includes a voltage step-down circuit 331, a charge control circuit 332, and a communication controller power supply circuit 333. The voltage step-down circuit includes a switching regulator 200, and a selection circuit 206 and 208 which can select an output path PT1 of the switching regulator and a bypass path PT2 of the switching regulator. The voltage step-down circuit includes a selection control circuit 207. The selection control circuit supplies voltage to the communication controller power supply circuit via the bypass path at the time of activating the communication controller. Since the output voltage of the series regulator stabilizes in a shorter time than the switching regulator, it becomes possible to keep the time from when RF power rises to when initial communication becomes possible, within standards.

主权项

1. A wireless communication device comprising:
a communication control circuit configured to transmit and receive control information; a power control circuit including a first regulator circuit, a second regulator circuit and a selection circuit,
the power control circuit being configured to receive a source voltage, supply a power supply voltage to the communication control circuit and output a charging voltage to a battery,the first regulator circuit being configured to input the source voltage and output a first voltage to the selection circuit;the second regulator circuit being configured to input the source voltage and output a second voltage to the selection circuit; wherein the selection circuit is configured to select and output either one of the first voltage and the second voltage as the power supply voltage, based on a level of the first voltage.