公开(公告)号：US12095378B2

公开(公告)日：2024-09-17

申请号：US17831028

申请日：2022-06-02

Applicant: DELTA ELECTRONICS, INC.

Inventor： Shang-Kay Yang ,  Hsien-Kai Wang ,  Yen-Wei Lin

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/08

CPC classification number: H02M3/33592 ,  H02M1/0032 ,  H02M1/08 ,  H02M1/0035

Abstract: A bridge converter converts an input voltage into an output voltage, and includes a switching circuit, a transformer, a rectifying circuit, and a control module. The switching circuit includes a first switch and a second switch. The control module sets a first time period and a second time period. The control module provides a first control signal and a second control signal to control the switching circuit based on the output voltage. The control module fixes an operation frequency of the first control signal and the second control signal at the maximum frequency based on that the control module is set in a standby mode, and provides the first control signal and the second control signal in the first time period, and shields the first control signal and the second control signal in the second time period.

公开(公告)号：US20250070653A1

公开(公告)日：2025-02-27

申请号：US18523802

申请日：2023-11-29

Applicant: Delta Electronics, Inc.

Inventor： Shang-Kay Yang ,  Hsien-Kai Wang ,  Yen-Wei Lin ,  Hsing-Yi Chung

IPC: H02M1/44 ,  H02M3/04

Abstract: An electromagnetic interference suppression method for at least one power supply is provided. Each of the at least one power supply includes a first conversion circuit and a second conversion circuit. The first conversion circuit receives an input voltage and outputs a first output voltage. The second conversion circuit receives the first output voltage and outputs a load current. If the input voltage received by the first conversion circuit of the at least one power supply is a DC voltage, an electromagnetic interference suppression operation is performed. Then, the electromagnetic interference suppression operation is performed to determine whether the load current is greater than a preset current and lower than an upper current limit. If the determining condition is satisfied, the first output voltage is dynamically adjusted, and a peak-peak value of the first output voltage is not zero with the varying load current.

公开(公告)号：US11658584B2

公开(公告)日：2023-05-23

申请号：US17534846

申请日：2021-11-24

Applicant: DELTA ELECTRONICS, INC.

Inventor： Shang-Kay Yang ,  Hsien-Kai Wang ,  Yen-Wei Lin

IPC: H02M3/335 ,  H02M3/00

CPC classification number: H02M3/33592 ,  H02M3/01 ,  H02M3/33571 ,  H02M3/33573

Abstract: An LLC resonance converter includes a switching circuit, a resonance tank, a transformer, a synchronous rectification unit, and a control unit. The switching circuit includes a first switch controlled by a first control signal and a second switch controlled by a second control signal. The synchronous rectification unit includes a first synchronous rectification switch controlled by a first rectification control signal and a second synchronous rectification switch controlled by a second rectification control signal. The first control signal, the first rectification control signal, the second control signal, and the second rectification control signal include an operation frequency and a phase shift amount. When the operating frequency is lower to a specific value or the phase shift amount is higher to a specific value, the control unit fixes one of them to extend a hold-up time of the LLC resonance converter.

公开(公告)号：US11677326B2

公开(公告)日：2023-06-13

申请号：US17331947

申请日：2021-05-27

Applicant: DELTA ELECTRONICS, INC.

Inventor： Shang-Kay Yang ,  Hsien-Kai Wang ,  Yen-Wei Lin

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/08

CPC classification number: H02M3/33573 ,  H02M1/0009 ,  H02M1/0035 ,  H02M1/08 ,  H02M3/33592

Abstract: An LLC resonant converter includes a transformer and a primary-side circuit coupled to the transformer. The primary-side circuit includes a first bridge arm, a second bridge arm, and a control unit. The first bridge arm includes a first switch and a second switch, and the second bridge arm includes a third switch and a fourth switch. The control unit provides a first control signal to control the first switch and provides a fourth control signal to control the fourth switch. The control unit adjusts a switching frequency of the first control signal and the fourth control signal according to an output voltage. When the switching frequency increases to a frequency threshold value, the switching frequency is controlled to be fixed at the frequency threshold, and the first control signal and the fourth control signal are controlled to have a variable phase difference.

公开(公告)号：US11509213B2

公开(公告)日：2022-11-22

申请号：US17370645

申请日：2021-07-08

Applicant: DELTA ELECTRONICS, INC.

Inventor： Shang-Kay Yang ,  Hsien-Kai Wang ,  Yen-Wei Lin

IPC: H02M3/335 ,  H02M3/00 ,  H02M1/00

Abstract: An LLC resonant converter includes a square wave generator having a first switch and a second switch, a resonant tank, a transformer, a synchronous rectifying (SR) unit having a first SR switch and a second SR switch, and a control unit. The control unit provides a first control signal controls the first switch, a second control signal controls the second switch, a first rectifying control signal controls the first SR switch, a second rectifying control signal controls the second SR switch. When a frequency control command is lower than a phase-shift frequency, the first control signal and the first rectifying control signal are frequency-variable and phase-shifted, and the second control signal and the second rectifying control signal are frequency-variable and phase-shifted.