公开(公告)号：US12034257B2

公开(公告)日：2024-07-09

申请号：US17740092

申请日：2022-05-09

Applicant: Chengli Li

Inventor： Chengli Li ,  Xiaoming Zhang ,  Fei Lin

IPC: H01R13/66 ,  H01R24/28 ,  H02H3/16

CPC classification number: H01R13/665 ,  H01R24/28 ,  H02H3/162

Abstract: A leakage current protection device (such as a power plug) for an electrical appliance includes a shell and a trip assembly inside the shell. The shell includes an upper cover and a base cover joined together, and either the upper cover or the base cover includes a first cover and a removable second cover. The removable second cover spatially corresponds to a tail portion of the trip assembly; when it is removed, the tail portion is exposed to allow a power cord to be connected to the leakage current protection device. By using a removable second cover, the cord can be conveniently assembled with the device when the device is installed on the electrical appliance, allowing the to be shipped without the cord. This can reduce the packed size of the device for easier shipping and storage, as well as lowering cost. It also makes the device more versatile.

公开(公告)号：US11973334B2

公开(公告)日：2024-04-30

申请号：US18178409

申请日：2023-03-03

Applicant: Chengli Li

Inventor： Chengli Li ,  Long Chen

IPC: H02H3/16 ,  H01H83/02 ,  H02H1/00 ,  H02H7/22

CPC classification number: H02H1/0038 ,  H01H83/02 ,  H02H3/16 ,  H02H7/228

Abstract: A power cord with leakage current detection and interruption (LCDI) function includes at least two power supply lines, at least two insulating layers respectively covering the at lease two power supply lines, at least two leakage current detection lines respectively disposed around the at least two insulating layers, including a first leakage current detection line and a second leakage current detection line, at least one connector line, electrically coupled to the first leakage current detection line and/or the second leakage current detection line, and at least one insulating structure, covering at least one of the at least two leakage current detection lines, to electrically insulate the first and second leakage current detection lines from each other.

公开(公告)号：US11258245B2

公开(公告)日：2022-02-22

申请号：US17013610

申请日：2020-09-06

Applicant: Chengli Li

Inventor： Chengli Li ,  Long Chen

IPC: H02H3/16 ,  G01R31/58 ,  G01R31/52 ,  H02H1/00 ,  H02H3/17 ,  H02H9/08 ,  G01R31/00

Abstract: An intelligent leakage current detection and interruption device for a power cord, including a switch module for controlling electrical connection of two power lines between input and output ends; a leakage current detection module, including two leakage current detection lines and a signal feedback line, one end of the parallelly coupled two leakage current detection lines being coupled via the signal feedback line to a point between the two power lines, for respectively detecting a leakage current on the two power lines; a detection monitoring module, coupled to the leakage current detection module, for detecting open circuit conditions in the two leakage current detection lines; and a drive module, coupled to the switch module, the leakage current detection module and the detection monitoring module, for driving the switch module to disconnect power to the output end in response to any detected leakage current or open circuit condition.

公开(公告)号：US11114430B2

公开(公告)日：2021-09-07

申请号：US16670808

申请日：2019-10-31

Applicant: Chengli Li

Inventor： Chengli Li ,  Shengyun Nie

IPC: H01L27/02 ,  H02H3/02 ,  G01R31/50

Abstract: A leakage current detection and protection device coupled between input and output ends of power lines, and includes first and second switching modules, a leakage current detection module, a self-test module, and first and second drive modules. When the leakage current detection module detects a leakage current on the power lines, the second drive module controls the second switching module to disconnect power to the output end. When the self-test module detects a fault in the leakage current detection module, the first drive module controls the first switching module to disconnect the power to the output ends. The first switching module is coupled between the input end and a point where the leakage current detection module, the self-test module, and the first and second drive modules are coupled, so that these modules are de-powered when the first switching module disconnects the electrical connection to output ends.

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：US10804638B1

公开(公告)日：2020-10-13

申请号：US16696019

申请日：2019-11-26

Applicant: Chengli Li

Inventor： Chengli Li ,  Xiaoming Zhang

IPC: H01R13/44 ,  H01R13/453 ,  H01R13/52

Abstract: A safety shield assembly for a power receptacle and a power receptacle incorporating the same. The assembly includes a frame, and a sliding block and a resilient member disposed in the frame. The frame has multiple openings corresponding to multiple socket holes of the power receptacle, a position limiting member, and a balancing support member. The sliding block has a sliding block base, two protection ramps disposed in the base and spaced apart, and two metal reinforcement members joined to and formed integrally with the two protection ramps to cover their inclined surfaces. When a power plug is inserted into the socket holes, two prongs of the plug push against the reinforcement members on the protection ramps and the sliding block slides away. When an object is inserted into only one socket hole, the balancing support member and position limiting member cooperate to prevent the sliding block from sliding.

公开(公告)号：US10770823B1

公开(公告)日：2020-09-08

申请号：US16446107

申请日：2019-06-19

Applicant: Chengli Li

Inventor： Chengli Li ,  Xiaoming Zhang ,  Shengyun Nie

IPC: H01R13/44 ,  H01R13/453 ,  H01R25/00

Abstract: A safety shield assembly for a power receptacle and a power receptacle incorporating the same. The safety shield assembly includes a frame and a sliding block and a resilient member disposed in the frame. The frame has multiple openings corresponding to multiple socket holes of the power receptacle, a position limiting member configured to abut the sliding block, and a balancing support member. In its initial state, the resilient member urges the sliding block to a closed position to covers the openings. The sliding block has two inclined surfaces. When an inserted object pushes on only one of the two inclined surfaces, the position limiting member limits the sliding motion of the sliding block; when two inserted objects simultaneously push on both inclined surfaces, the sliding block is balanced on the balancing support member and is able to slides along the frame to expose the openings.

公开(公告)号：US10571526B2

公开(公告)日：2020-02-25

申请号：US15878242

申请日：2018-01-23

Applicant: Chengli Li

Inventor： Chengli Li ,  Guolan Yue

IPC: H02H3/00 ,  G01R31/50 ,  H02H3/33 ,  H01H71/12 ,  H02H3/10 ,  G01R35/00 ,  G01R31/28 ,  H01H71/04 ,  H01H83/04 ,  H01H83/14

Abstract: A ground fault circuit interrupter device includes a switch module having a reset switch, a control switch mechanically linked to the reset switch, a ground fault detection module, a self-testing module and a tripping module. The switch module controls the electrical connection between the input and output ends of the device. The ground fault detection module detects a leakage current signal at the output end. The self-testing module is coupled to the ground fault detection module and periodically generates a self-test pulse signal which simulates the leakage current signal. The tripping module is electrically coupled to the ground fault detection module and mechanically coupled to the switch module and the control switch, to control the movement of the switch module and the control switch. The control switch, which opens and closes at the same time as the reset switch, controls the power supply to the self-testing module.

公开(公告)号：US09547047B2

公开(公告)日：2017-01-17

申请号：US14614334

申请日：2015-02-04

Applicant: Chengli Li

Inventor： Chengli Li ,  Guolan Yue

IPC: G01R35/00 ,  H02H3/33 ,  G01R31/42

CPC classification number: G01R31/42 ,  G01R31/025 ,  G01R35/00 ,  H02H3/335

Abstract: A leakage current detection device coupled to AC power supply wires carrying an AC signal, which includes: a leakage current detection circuit including a leakage current detector, the leakage current detection circuit operating during first half-cycles among positive and negative half-cycles of the AC signal to detect a leakage current of the power supply wires and to disconnect the power supply wires from an output side when a leakage current exceeding a first threshold value is detected; and a self-detecting circuit coupled to the leakage current detection circuit, operating during second half-cycles among the positive and negative half-cycles of the AC signal to test whether the leakage current detection circuit is functioning normally.

Abstract translation: 一种泄漏电流检测装置，其耦合到承载AC信号的AC电源线，其包括：漏电流检测电路，包括泄漏电流检测器，所述漏电流检测电路在所述漏电流检测电路的正半周期和负半周期期间 AC信号，当检测到超过第一阈值的泄漏电流时，检测电源线的漏电流并断开电源线与输出侧的连接; 以及耦合到泄漏电流检测电路的自检测电路，在AC信号的正半周期和负半周期期间的第二半周期期间进行操作，以测试泄漏电流检测电路是否正常工作。