公开(公告)号：US20230223866A1

公开(公告)日：2023-07-13

申请号：US17961800

申请日：2022-10-07

Applicant: DELTA ELECTRONICS, INC.

Inventor： Kai-Wei HU ,  Ping-Heng WU ,  Lei-Chung HSING

IPC: H02M7/487 ,  H02M7/5387

CPC classification number: H02M7/487 ,  H02M7/53871

Abstract: A method of clamping an output current of a three-phase power converter is provided. The three-phase power converter includes three switching bridge arms and provides a three-phase output voltage command, and each switching bridge arm has an upper switch and a lower switch connected in series. The method includes steps of: determining that the output current is greater than a first current threshold to activate a current clamping control procedure, comparing a carrier signal with the three-phase output voltage command to turn on the lower switches by a first zero vector when the carrier signal is rising and turn on the upper switches by a second zero vector when the carrier signal is falling, determining that the output current is greater than a second current threshold to activate an overcurrent protection procedure, wherein the second current threshold is greater than the first current threshold.

公开(公告)号：US20230132524A1

公开(公告)日：2023-05-04

申请号：US17687076

申请日：2022-03-04

Applicant: DELTA ELECTRONICS, INC.

Inventor： Ping-Heng WU ,  Kai-Wei HU ,  Lei-Chung HSING

IPC: H02M1/08 ,  H02M7/5395

Abstract: A method of controlling a power converter is provided. The power converter generates a three-phase output power by switching an input power through a plurality of switches. The method includes steps of: acquiring a three-phase output command corresponding to the three-phase output power; comparing the three-phase output command with a control carrier to acquire a voltage phase angle corresponding to the three-phase output command; acquiring a three-phase current value of the three-phase output power; detecting the voltage phase angle and a positive/negative change of the three-phase current value to decide a zero-sequence voltage; composing the zero-sequence voltage and the three-phase output command to acquire a three-phase output expected value; comparing the three-phase expected values with the control carrier to acquire a turned-on time of each switch; and switching the input power to adjust the three-phase output power according to the turned-on time of each switch.

公开(公告)号：US20240069090A1

公开(公告)日：2024-02-29

申请号：US18151701

申请日：2023-01-09

Applicant: DELTA ELECTRONICS, INC.

Inventor： Kai-Wei HU ,  Ping-Heng WU ,  Lei-Chung HSING

IPC: G01R31/26 ,  G01R31/52 ,  H02M5/458

CPC classification number: G01R31/2617 ,  G01R31/52 ,  H02M5/458

Abstract: A switch short-circuited diagnosis method includes steps of: determining an initial voltage interval of multiple voltage intervals according to voltage relationships between voltages of a first phase wire, a second phase wire, and a third phase wire; performing a switch short-circuited diagnosis of a first bidirectional switch module in the three consecutive voltage intervals from the initial voltage interval, and including steps of: turning on a first switch branch, a second switch branch, or a third switch branch of the first bidirectional switch module according to the voltage relationships between the voltages of the first, second and third phase wires, determining whether an overcurrent occurs to diagnose whether the first switch branch, the second switch branch, or the third switch branch of the first bidirectional switch module is in a short-circuited state, and performing the switch short-circuited diagnosis for the next voltage interval.