公开(公告)号：US10291137B2

公开(公告)日：2019-05-14

申请号：US16040501

申请日：2018-07-19

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Chien-Fu Tang ,  Isaac Y. Chen ,  Tzu-Chen Lin ,  Kun-Yu Lin ,  Li-Yang Hsiao ,  Yung-Chih Lai

IPC: H02M3/335 ,  H02M1/36 ,  H02M1/08

Abstract: A flyback power converter includes a transformer having an auxiliary winding for generating an auxiliary voltage and providing a supply voltage on a supply node; a primary side controller circuit which is powered by the supply voltage from the supply node; and a high voltage (HV) start-up circuit. The HV start-up circuit is coupled to an high voltage signal through a HV input terminal and generates the supply voltage through a supply output terminal, wherein when the supply voltage does not exceed a start-up voltage threshold, a HV start-up switch conducts the HV input terminal and the supply output terminal to provide the supply voltage, and when the supply voltage exceeds a start-up voltage threshold, the HV start-up switch is OFF. The HV start-up circuit and the primary side controller circuit are packaged in two separate integrated circuit packages respectively.

公开(公告)号：US20190028033A1

公开(公告)日：2019-01-24

申请号：US16040501

申请日：2018-07-19

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Chien-Fu Tang ,  Isaac Y. Chen ,  Tzu-Chen Lin ,  Kun-Yu Lin ,  Li-Yang Hsiao ,  Yung-Chih Lai

IPC: H02M3/335 ,  H02M1/08 ,  H02M1/36

Abstract: A flyback power converter includes a transformer having an auxiliary winding for generating an auxiliary voltage and providing a supply voltage on a supply node; a primary side controller circuit which is powered by the supply voltage from the supply node; and a high voltage (HV) start-up circuit. The HV start-up circuit is coupled to an high voltage signal through a HV input terminal and generates the supply voltage through a supply output terminal, wherein when the supply voltage does not exceed a start-up voltage threshold, a HV start-up switch conducts the HV input terminal and the supply output terminal to provide the supply voltage, and when the supply voltage exceeds a start-up voltage threshold, the HV start-up switch is OFF. The HV start-up circuit and the primary side controller circuit are packaged in two separate integrated circuit packages respectively.