公开(公告)号：US10153706B2

公开(公告)日：2018-12-11

申请号：US15805273

申请日：2017-11-07

Applicant: Delta Electronics, Inc.

Inventor： Jianping Ying ,  Teng Liu ,  Yi Zhang ,  Yong Zeng

IPC: H02M5/40 ,  H02M5/458 ,  H02M1/36 ,  H02M1/42

Abstract: The present disclosure provides a precharge device and a frequency converter. The precharge device is applied in a flying capacitor type multi-level converter circuit, and the multi-level converter circuit includes: a flying capacitor, a bus capacitor, a first and second semiconductor components, wherein the first semiconductor component is electrically connected between a first end of the flying capacitor and a first end of the bus capacitor, and the second semiconductor component is electrically connected between a second end of the flying capacitor and a second end of the bus capacitor; and the precharge device includes: an AC source; and an auxiliary circuit electrically connected with the AC source, wherein the auxiliary circuit reuses the first and second semiconductor components, and the AC source charges the flying capacitor and the bus capacitor through the auxiliary circuit.