公开(公告)号：US20250158513A1

公开(公告)日：2025-05-15

申请号：US18641461

申请日：2024-04-22

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang ,  Chang-Yu Ho

IPC: H02M1/36 ,  H02M1/08 ,  H02M1/32 ,  H02M3/07 ,  H02M3/158

Abstract: A pre-bias voltage control circuit includes a flying capacitor, a voltage sensor, and a voltage controlled current source. The voltage sensor is used to generate a sensed capacitor voltage according to a capacitor voltage across the flying capacitor, and includes an inverting input terminal coupled to the flying capacitor, a non-inverting input terminal coupled to the flying capacitor, and an output terminal for outputting the sensed capacitor voltage. The voltage controlled current source is used to charge and discharge the flying capacitor, and includes a reference terminal for receiving a reference voltage, an input terminal coupled to the output terminal of the voltage sensor, a current output terminal coupled to the flying capacitor, and a current return terminal coupled to the flying capacitor. The voltage controlled current source generates a source current to charge the flying capacitor when the sensed capacitor voltage falls below the reference voltage.