公开(公告)号：US20240410927A1

公开(公告)日：2024-12-12

申请号：US18348161

申请日：2023-07-06

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN ,  Guolan YUE

IPC: G01R31/08

Abstract: An arc fault detection circuit includes a signal collection circuit that collects a current signal on power supply lines and to output a first signal; a window gating circuit that generates a window gating signal corresponding to the first signal; and a signal processing circuit, coupled to the signal collection circuit and the window gating circuit, for generating an arc fault signal based on the window gating signal and the first signal. By using the window gating circuit, the arc fault detection circuit performs arc detection only during certain time intervals of the AC period where the harmful arcs will be present. This improves the accuracy of arc detection and reduces the probability of false tripping.

公开(公告)号：US20240044998A1

公开(公告)日：2024-02-08

申请号：US17819283

申请日：2022-08-11

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN ,  Shengyun NIE

IPC: G01R31/52 ,  H02H1/00 ,  H02H3/16

CPC classification number: G01R31/52 ,  H02H1/0007 ,  H02H3/16

Abstract: A leakage current detection and interruption (LCDI) device includes a switch module to control electrical connection of first and second power supply lines between input and output ends, a leakage current detection module including first and second leakage current detection lines respectively covering the first and second power supply lines to detect leakage currents thereon, a detection monitoring module coupled to the leakage current detection module and the first and second power supply lines to generate an open circuit detection signal in response to an open circuit condition in the first or second leakage current detection line, and a test module including a normally closed test switch coupled to the first or second leakage current detection line, wherein when the test switch is manually operated to open, the switch module disconnects the first and second power supply lines between the input and output ends.

公开(公告)号：US20210265832A1

公开(公告)日：2021-08-26

申请号：US17314976

申请日：2021-05-07

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN

IPC: H02H3/16 ,  H02H1/00 ,  G01R31/52 ,  G01R31/58

Abstract: An leakage current detection and protection device includes a leakage current detection module for detecting a leakage current on the power supply lines and generating a detection feedback signal in response thereto, a self-test module for testing whether the leakage current detection module is faulty, and a trip module for disconnecting the power supply lines in response to the self-test fault signal. The self-test module includes a simulated leakage current trigger circuit for generating a simulated leakage current trigger signal, a simulated leakage current generating circuit for generating a simulated leakage current signal in response to the simulated leakage current trigger signal, a trigger signal turn-off module for turning off the simulated leakage current trigger signal in response to the detection feedback signal, and a fault signal generating module for detecting a fault in the leakage current detection module and generating a self-test fault signal in response thereto.

公开(公告)号：US20210111554A1

公开(公告)日：2021-04-15

申请号：US16653457

申请日：2019-10-15

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN ,  Shengyun NIE

IPC: H02H7/20 ,  H01R13/713 ,  H02H1/00

Abstract: A leakage current detection and protection device, and power connector and electrical appliance employing the same. The device includes: a leakage current detection module which detects a leakage current on the power lines to generate a leakage fault signal; a self-test module which periodically generates a simulated leakage current and outputs a self-test fault signal when the leakage current detection module is faulty; a trip module, including a switch coupled between the input and output ends of the power lines, and a first trip coil which drives the switch; a drive module which drives the trip module to disconnect the electrical connection between the input and output ends in response to the leakage fault signal and/or the self-test fault signal; and a trip function detection module which generates a trip coil fault signal in response to detecting an open circuit in the first trip coil to disconnect the electrical connection.

公开(公告)号：US20200091707A1

公开(公告)日：2020-03-19

申请号：US16687129

申请日：2019-11-18

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN

IPC: H02H7/22 ,  H01R13/713 ,  H02H1/00 ,  H01R13/717

Abstract: A leakage current detection and interruption (LCDI) device for power cord, and power connector and appliance employing the same. The LCDI device includes a switch module coupled on the power supply lines to control electrical connection between input and output ends of the device; a leakage current detection module including a leakage current detection line, for detecting a leakage current on the power supply lines and outputting a leakage current fault signal accordingly; a drive module, for driving the switch module to disconnect the electrical connection in response to the leakage current fault signal and/or an open circuit fault signal, the open circuit fault signal representing an open circuit condition of the leakage current detection line; and a test module including a test switch, coupled to the leakage current detection module, where the leakage current detection module outputs the leakage current fault signal when the test switch is closed.

公开(公告)号：US20250004052A1

公开(公告)日：2025-01-02

申请号：US18347012

申请日：2023-07-05

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN

IPC: G01R31/327 ,  G01R31/52 ,  H02H1/04

Abstract: A leakage current detection and interruption (LCDI) device includes a leakage current detection module, including a first and a second leakage current detection line and at least one resistive element and/or at least one semiconductor element, configured to detect a leakage current signal on the first or second current-carrying line and to generate a leakage fault signal in response to detecting the leakage current signal. The first and second leakage current detection lines are electrically insulated from each other, and respectively cover one of the first and second current-carrying lines. The at least one resistive element and/or semiconductor element is coupled in series between the first and second leakage current detection lines to form a current path for detecting an open circuit fault in the leakage current detection module. By detecting the fault in the first and second leakage current detection lines, the reliability of the LCDI device is improved.

公开(公告)号：US20240426940A1

公开(公告)日：2024-12-26

申请号：US18447206

申请日：2023-08-09

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN ,  Guolan YUE

IPC: G01R31/52 ,  G01R31/327 ,  H02H1/00

Abstract: An electrical fault detection and interruption device includes a switch module coupled between input and output ends of current carrying lines, for controlling an electrical connection between the two ends; a signal collection module, for detecting a fault signal on the current carrying lines and converting it to an electrical signal; a signal processing module, for determining whether a fault is present on the current carrying lines based on the electrical signal, and generating an electrical fault signal accordingly; a drive module, for driving the switch module to disconnect the electrical connection between the input and output ends in response to receiving the electrical fault signal; and an alarm module, for generating an alarm signal in response to receive the electrical fault signal. Thus, even when the device malfunctions and loses its protection function, it can still generate an alarm signal to alert the user.

公开(公告)号：US20240421582A1

公开(公告)日：2024-12-19

申请号：US18818335

申请日：2024-08-28

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN

IPC: H02H1/00 ,  G01R31/52 ,  H01H83/02 ,  H02H3/16

Abstract: A leakage current detection and interruption device includes a switch for controlling an electrical connection between input and output ends of power supply lines; a leakage current detection module for generating a leakage fault signal when detecting a leakage current on the power supply lines; a drive module coupled to the leakage current detection module and the switch, for controlling the switch to disconnect or connect the electrical connection; a wireless communication module including a signal processing chip, coupled to the drive module and/or the leakage current detection module and/or the output end, for wirelessly communicating with a remote control device to allow the remote control device to perform at least one of: controlling the switch to disconnect or connect the electrical connection, setting parameters of the device, and obtaining electrical connection information and/or fault information of the device. The device enables remote control and monitor, using a simple structure.

公开(公告)号：US20240292586A1

公开(公告)日：2024-08-29

申请号：US18118305

申请日：2023-03-07

Applicant: Chengli LI

Inventor： Chengli LI ,  Long CHEN

IPC: H05K9/00 ,  H01B9/00 ,  H02H7/22

CPC classification number: H05K9/0098 ,  H01B9/00 ,  H02H7/226

Abstract: A power cord includes at least two power supply lines, at least two insulation layers respectively covering the power supply lines, first and second shield layers respectively disposed around corresponding insulating layers to detect leakage currents on the corresponding power supply lines, at least one shield insulating layer disposed between the first and second shield layers to electrically insulate them from each other, a first and a second signal conductor disposed either between the first (or second) shield layer and the corresponding insulation layer or outside the first (or second) shield layer. Each signal conductors is formed of at least one conductor wire and at least one filament in a twisted or woven structure and configured to conduct the leakage current. The signal conductors have great tensile strength which solves the problem of breaking of the signal conductors.

公开(公告)号：US20240097426A1

公开(公告)日：2024-03-21

申请号：US17934552

申请日：2022-09-22

Applicant: Chengli Li

Inventor： Long CHEN ,  Chengli LI ,  Guolan YUE

IPC: H02H3/05 ,  G01R31/52 ,  H01H47/00 ,  H01H47/32 ,  H01H71/24 ,  H02H3/08

CPC classification number: H02H3/05 ,  G01R31/52 ,  H01H47/002 ,  H01H47/32 ,  H01H71/24 ,  H02H3/08 ,  H01R13/713

Abstract: A leakage current detection and interruption device includes a switch module configured to control electrical connection between input and output ends of power supply lines; a leakage current detection module configured to generate a leakage fault signal in response to a leakage current in the power supply lines; a leakage-responsive drive module configured to drive the switch module to disconnect the electrical connection in response to the leakage fault signal; a fault-responsive drive module configured to drive the switch module to disconnect the electrical connection in response to a fault in the leakage-responsive drive module; and a self-test module configured to generate a self-test signal and to generate a self-test fault signal in response to a fault in the leakage current detection module and/or the leakage-responsive drive module. By providing the fault-responsive drive module, the device can automatically disconnect the electrical power when the leakage-responsive drive module has a fault.