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公开(公告)号：US12206231B2
公开(公告)日：2025-01-21
申请号：US17706138
申请日：2022-03-28
Applicant: Chengli Li
Inventor： Chengli Li , Long Chen , Guolan Yue
Abstract: A leakage current detection and interruption device includes a switch module for controlling electrical connection of 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 current thereon and to generate respective first and second leakage signals in response thereto; a signal processing module, coupled to the leakage current detection module to receive the first and/or second leakage signals and to generate a leakage fault signal in response thereto; and a trigger module, coupled to the switch module and the signal processing module, to receive the leakage fault signal and in response thereto, to drive the switch module to disconnect the electrical connection to the output end. The device can detect current leaks on the two power supply lines and is simple, low-cost and reliable.
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2.发明授权公开(公告)号：US11658475B1
公开(公告)日：2023-05-23
申请号：US17558357
申请日：2021-12-21
Applicant: Chengli Li
Inventor： Chengli Li , Long Chen
CPC classification number: H02H3/16 , H02H1/0007
Abstract: A leakage current detection and interruption device coupled to power supply lines, including a leakage current detection module for generating a leakage current fault signal when detecting leakage currents on the lines; a trip drive module responsive to the leakage current fault signal to drive a switch to disconnect power on the lines, the trip drive module including a first semiconductor device responsive to the leakage current fault signal to cause a current in a first coil to drive the switch; a coil function detection module for generating a coil fault signal when detecting a fault in the first coil; a self-test module for generating a self-test fault signal when detecting a fault in the leakage current detection module or the first semiconductor device; and a detection drive module for driving the switch to disconnect power in response to the coil fault signal or the self-test fault signal.
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公开(公告)号：US11223192B2
公开(公告)日：2022-01-11
申请号：US16746510
申请日：2020-01-17
Applicant: Chengli Li
Inventor： Chengli Li , Guolan Yue , Long Chen
Abstract: A leakage current protection device with automatic reset after power outage includes a switch, a power supply module, a leakage current detection module, a self-testing module, a drive control module, and a first reset module. The drive control module drives the switch based on a leakage current signal from the leakage current detection module and/or a self-test fault signal from the self-testing module. The first reset module functions to automatically set the leakage current protection device in a connected state when power resumes after an outage. Another leakage current protection device with manual reset after power outage includes similar components above and also a second reset module, which functions to automatically set the leakage current protection device in a disconnected state when power resumes after an outage; the device can then be manually reset using a reset switch. These two devices can suit different needs of different electrical appliances.
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公开(公告)号：US11005260B2
公开(公告)日：2021-05-11
申请号：US16687129
申请日：2019-11-18
Applicant: Chengli Li
Inventor： Chengli Li , Long Chen
IPC: H02H7/00 , H02H7/22 , H01R13/717 , H02H1/00 , H01R13/713
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.
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公开(公告)号：US12105157B2
公开(公告)日：2024-10-01
申请号：US17819283
申请日：2022-08-11
Applicant: Chengli Li
Inventor： Chengli Li , Long Chen , Shengyun Nie
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.
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Patent Agency Ranking
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
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.
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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
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.
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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.
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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
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.
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公开(公告)号：US11600984B1
公开(公告)日：2023-03-07
申请号：US17682598
申请日：2022-02-28
Applicant: Chengli Li
Inventor： Chengli Li , Long Chen
Abstract: A leakage current detection and interruption (LCDI) device for a power cord includes a switch module that controls an electrical connection of first and second power supply lines between input and an output ends; a leakage current detection module, including first and second leakage current detection lines, which respectively cover the first and second power supply lines, and are respectively configured to detect leakage current signals on the first and second power supply lines and to generate self-test fault signals in response to the first and second leakage current detection lines having an open circuit; and a drive module which receives the first and/or second leakage current signal and the first and/or second self-test fault signal, and drives the switch module to disconnect the electrical connection in response to these signals. The LCDI device can individually detect leaks on the two power supply lines and open circuit on the two leakage current detection lines.
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