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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：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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Patent Agency Ranking
公开(公告)号：US11489331B2
公开(公告)日：2022-11-01
申请号：US17349133
申请日：2021-06-16
Applicant: Chengli Li
Inventor： Chengli Li , Long Chen
Abstract: A leakage current detection and protection device includes a leakage current detection module for generating a detection feedback signal when detecting a leakage current on the power supply lines, wherein the power supply lines supply a working power to the leakage current detection module during half of the AC power cycles; a self-test module for testing whether the leakage current detection module is faulty based on the detection feedback signal, which includes: a simulated leakage current generating circuit for generating a simulated leakage current signal; a fault signal generating module for generating a self-test fault signal when the leakage current detection module has a fault; and a self-test compensation module for supplying an auxiliary working power to the leakage current detection module so the leakage current detection module is in a working state whenever the simulated leakage current is generated. This prevents misjudgment by the leakage current detection module.
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公开(公告)号：US11444448B2
公开(公告)日：2022-09-13
申请号：US17314976
申请日：2021-05-07
Applicant: Chengli Li
Inventor： Chengli Li , Long Chen
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.
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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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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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