公开(公告)号：US10168368B1

公开(公告)日：2019-01-01

申请号：US15983109

申请日：2018-05-18

Applicant: DELTA ELECTRONICS, INC.

Inventor： Ming-Xuan Dong ,  Yan Ma ,  Chang-Yong Wang ,  Ai-Bin Qiu

IPC: H02M7/757 ,  G01R27/26 ,  H02M7/5387 ,  H02M1/36

Abstract: A method for estimating capacitance applied to a three phase converting device is disclosed. The three phase converting device includes a three phase converter and a processor. The processor executes following steps: (a) outputting a non-baseband signal to the three phase converter, such that a bus voltage of the three phase converter generates a non-baseband flutter; (b) obtaining the bus voltage of the three phase converter; (c) obtaining a bus voltage estimating value based on the bus voltage, a bus capacitance estimating value, an input power, and an output power of the three phase converter; (d) respectively outputting a first AC component and a second AC component corresponding to the non-baseband flutter through filtering the bus voltage and the bus voltage estimating value by a filter segment; (e) estimating a bus capacitance based on the first AC component, the second AC component and a bus capacitance initial value.