公开(公告)号：US11018496B2

公开(公告)日：2021-05-25

申请号：US16653457

申请日：2019-10-15

Applicant: Chengli Li

Inventor： Chengli Li ,  Long Chen ,  Shengyun Nie

IPC: H02H3/00 ,  H02H7/20 ,  H02H1/00 ,  H01R13/713

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：US10931095B1

公开(公告)日：2021-02-23

申请号：US16564857

申请日：2019-09-09

Applicant: Chengli Li

Inventor： Chengli Li ,  Long Chen ,  Shengyun Nie

IPC: H02H3/33 ,  H02H3/32 ,  H02H3/04 ,  H02H1/00

Abstract: A relay-type leakage current protection device includes a switch circuit, a relay circuit, a leakage current detection circuit, a self-test circuit, and a drive circuit. The switch circuit controls electrical connection between input and output ends of the power supply. The relay circuit is coupled to the input end and controls the open/close state of the switch circuit. The leakage current detection circuit detects a leakage current on the power supply lines. The self-test circuit is coupled to the power supply lines and the leakage current detection circuit, to generate a self-test pulse signal which simulates the leakage current and to detect a fault condition in the leakage current detection circuit. The drive circuit drives the relay circuit in response to receiving a leakage current signal from the leakage current detection circuit or a fault signal from the self-test circuit.

公开(公告)号：US12237665B2

公开(公告)日：2025-02-25

申请号：US18173655

申请日：2023-02-23

Applicant: Chengli Li

Inventor： Chengli Li ,  Long Chen

IPC: H02H3/32 ,  G01R31/52 ,  H02H1/00

Abstract: A leakage current detection and interruption device for a power cord includes a switch module that controls an electrical connection of first and second power supply lines because input and output ends; a leakage current detection module, including first and second leakage current detection lines, which respectively detect leakage current signals on the first and second power supply lines and generate self-test fault signals in response to the first and second leakage current detection lines having an open circuit; and a drive module including at least one solenoid, a first semiconductor device forming a first current path from the first to the second power supply line when conductive, and a second semiconductor device forming a second current path from the second to the first power supply line when conductive, to supply current to the solenoid which in turn drives the switch module to disconnect the electrical connection.

公开(公告)号：US12237660B2

公开(公告)日：2025-02-25

申请号：US17934552

申请日：2022-09-22

Applicant: Chengli Li

Inventor： Long Chen ,  Chengli Li ,  Guolan Yue

IPC: H02H3/08 ,  G01R31/52 ,  H01H47/00 ,  H01H47/32 ,  H01H71/24 ,  H02H3/05 ,  H02H9/02 ,  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.

公开(公告)号：US12046893B2

公开(公告)日：2024-07-23

申请号：US17840233

申请日：2022-06-14

Applicant: Chengli Li

Inventor： Chengli Li ,  Long Chen

IPC: H02H3/16 ,  G01R31/52

CPC classification number: H02H3/16 ,  G01R31/52

Abstract: A leakage current detection and interruption device for power cord includes a switch module, a leakage current detection module, an open circuit detection module, and a trigger module. The switch module controls the electrical connection between input and output ends of the power cord. The leakage current detection module has two leakage current detection lines to collect leakage current on the power supply lines of the power cord. The open circuit detection module is coupled to the leakage current detection module, and generates an open-circuit fault signal when an open circuit exists in at least one of the two leakage current detection lines. The trigger module is coupled to the switch module and the open circuit detection module, and receives a leakage fault signal and/or the open-circuit fault signal, and in response thereto, drives the switch module to disconnect the electrical connection between the input and output ends.