公开(公告)号：US10666135B2

公开(公告)日：2020-05-26

申请号：US16005594

申请日：2018-06-11

Applicant: Linear Technology LLC

Inventor： Xu Zhang ,  Jian Li ,  San Hwa Chee

IPC: H02M3/07 ,  G05F3/08 ,  H02M1/36 ,  H02M1/08

Abstract: Methods and systems of controlling a switched capacitor converter are provided. Upon determining that a voltage across a flying capacitor is above a first threshold, a first current is drawn from a first terminal of the flying capacitor by a first current source, and a second current is provided to a second terminal of the flying capacitor by a second current source. Upon determining that the voltage across the flying capacitor is below a second threshold, the first current is provided to the first terminal of the flying capacitor by the first current source, and the second current is drawn from the second terminal of the flying capacitor by the second current source. Upon determining that the voltage across the flying capacitor is above the second threshold and below the first threshold from the reference voltage, the first and second current sources are turned OFF.

公开(公告)号：US10340794B1

公开(公告)日：2019-07-02

申请号：US16132065

申请日：2018-09-14

Applicant: Linear Technology LLC

Inventor： Xu Zhang ,  Zhouyuan Shi

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

Abstract: A switched capacitor converter includes a primary switching circuit, a flying capacitor circuit, and a secondary switching circuit. The primary switching circuit includes plurality of switching transistors in series. The flying capacitor circuit includes one or more flying capacitors with each flying capacitor connected to a switching transistor. The secondary switching circuit includes two or more switching transistors and provides a first path for charging and a second path for discharging the flying capacitors. At startup, the flying capacitors are discharged via a first current source while the switching transistors are turned off. After discharging, the flying capacitors are charged via a second current source, while a first switching transistor of the primary switching circuit is kept turned off and the rest of the switching transistors perform switching according to a switching cycle. After charging, the switched capacitor converter may enter a steady state operation.