公开(公告)号：US20210373058A1

公开(公告)日：2021-12-02

申请号：US17181662

申请日：2021-02-22

Applicant: DELTA ELECTRONICS, INC.

Inventor： Li-Ching YANG ,  Wen-Lung HUANG ,  Sheng-Hua LI

IPC: G01R27/26 ,  H02M1/00 ,  H03F3/45 ,  G01R19/22

Abstract: A detection apparatus for unbalanced DC link capacitor voltage, the DC link provides a DC voltage and includes a plurality of capacitors coupled in series to two ends of the DC link and a plurality of balanced resistors coupled in series to two ends of the DC link and corresponding to the capacitors. The detection apparatus includes a plurality of sense resistors and a current sensor. One end of each sense resistor is coupled to a common-connected node of two capacitors, and the other end thereof is coupled to a common-connected node of two balanced resistors. The current sensor is coupled to one of the sense resistors and measures a current value of a current flowing through the sense resistor coupled to the current sensor.

公开(公告)号：US20240264218A1

公开(公告)日：2024-08-08

申请号：US18637993

申请日：2024-04-17

Applicant: DELTA ELECTRONICS, INC.

Inventor： Li-Ching YANG ,  Wen-Lung HUANG ,  Sheng-Hua LI

IPC: G01R31/14

CPC classification number: G01R31/14

Abstract: An insulation resistance detection circuit is coupled to a positive end and a negative end of a DC power source, and is used to detect a positive insulation resistance between the positive end and a ground point and detect a negative insulation resistance between the negative end and the ground point. A detection unit sets a first estimated resistance and a second estimated resistance, and acquires a first voltage based on turning on the switch and acquires a second voltage based on turning off the switch. The detection unit calculates a third voltage and a fourth voltage according to the first estimated resistance and the second estimated resistance so as to detect the positive insulation resistance and the negative insulation resistance when the third voltage is equal to the first voltage and the fourth voltage is equal to the second voltage.

公开(公告)号：US20230305052A1

公开(公告)日：2023-09-28

申请号：US17892512

申请日：2022-08-22

Applicant: DELTA ELECTRONICS, INC.

Inventor： Li-Ching YANG ,  Wen-Lung HUANG ,  Sheng-Hua LI

IPC: G01R31/14

CPC classification number: G01R31/14

Abstract: An insulation resistance detection circuit is coupled to a positive end and a negative end of a DC power source, and is used to detect a positive insulation resistance between the positive end and a ground point and detect a negative insulation resistance between the negative end and the ground point. A detection unit sets a first estimated resistance and a second estimated resistance, and acquires a first voltage based on turning on the switch and acquires a second voltage based on turning off the switch. The detection unit calculates a third voltage and a fourth voltage according to the first estimated resistance and the second estimated resistance so as to detect the positive insulation resistance and the negative insulation resistance when the third voltage is equal to the first voltage and the fourth voltage is equal to the second voltage.

公开(公告)号：US20250149973A1

公开(公告)日：2025-05-08

申请号：US18648353

申请日：2024-04-27

Applicant: DELTA ELECTRONICS, INC.

Inventor： Li-Ching YANG ,  Wen-Lung HUANG ,  Sheng-Hua LI

IPC: H02M1/088 ,  H02M1/00 ,  H02M1/32

Abstract: A power supply system includes a voltage conversion circuit and at least one voltage detector. The voltage conversion circuit converts AC voltage into DC voltage. The voltage detector includes a voltage dividing circuit, a phase voltage detection circuit, and a line voltage detection circuit. The voltage dividing circuit is coupled to the voltage conversion circuit to receive AC voltage. The voltage dividing circuit includes multiple impedance elements and multiple voltage dividing nodes to output multiple divided voltages. The phase voltage detection circuit is coupled to one of the voltage dividing nodes of voltage dividing circuit to generate a phase voltage detection signal based on one of the divided voltages. The line voltage detection circuit is coupled to a part of the voltage dividing nodes of voltage dividing circuit to generate a line voltage detection signal based on a part of the divided voltages.

公开(公告)号：US20210203317A1

公开(公告)日：2021-07-01

申请号：US17011370

申请日：2020-09-03

Applicant: DELTA ELECTRONICS, INC.

Inventor： Li-Ching YANG ,  Wen-Lung HUANG ,  Sheng-Hua LI

IPC: H03K17/0812 ,  H02M3/158

Abstract: A pre-charge control circuit includes a control unit, a conversion unit, and a pre-charge switch. The control unit provides a control signal according to a PWM signal, and the conversion unit provides a control voltage according to the control signal. The pre-charge switch adjusts a magnitude of the current flowing through the input path of the electronic circuit according to the control voltage.