公开(公告)号：US20180309355A1

公开(公告)日：2018-10-25

申请号：US15798379

申请日：2017-10-30

Applicant: DELTA ELECTRONICS, INC.

Inventor： Sin-Hong CHEN ,  Ho HUANG ,  Xin-Hung LIN

IPC: H02M1/00 ,  H02M3/04

CPC classification number: H02M1/00 ,  G05F1/67 ,  H02J3/385 ,  H02M3/04 ,  H02M2001/0009

Abstract: A maximum power point tracking method includes: configuring a voltage tuning direction of a power converter by a process circuit such that the input voltage of the power converter changes in a positive or a negative trend; detecting the corresponding input voltage and input current of the power converter sequentially to obtain multiple powers; and when the powers decrease for N times continuously, change the voltage tuning direction of the power converter such that the change of the input voltage switches from positive trend to negative trend, or from negative trend to positive trend, in which N is an integer greater than or equal to 2.

公开(公告)号：US20210281075A1

公开(公告)日：2021-09-09

申请号：US17023408

申请日：2020-09-17

Applicant: DELTA ELECTRONICS, INC.

Inventor： Sin-Hong CHEN ,  Tsung-Han TSAI ,  Xin-Hung LIN

IPC: H02J3/38 ,  H02M7/48

Abstract: A smart grid system includes a current sensor, and plural power conversion devices coupled to an AC grid. The current sensor measures a total current flowed through the AC grid, thereby providing a measured current value. The power conversion devices include a master power conversion device and plural slave power conversion devices. The master power conversion device receives the measured current value, thereby controlling an output power of the master power conversion device and providing a first duty cycle signal according to the measured current value. A first one of the slave power conversion devices which is coupled to the master power conversion device receive the first duty cycle signal, thereby controlling an output power of the first one of the slave power conversion devices according to the first duty cycle signal. The master power conversion device and the slave power conversion devices are communicated via a daisy chain connection.