Patents by Inventor Man Yau LAW
Man Yau LAW has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11264987Abstract: Methods and apparatus for detecting possible living body contact at an electrical contact surface is disclosed, comprising sending a non-hazardous probing signal to the contact surface, detecting an electrical response from the contact surface in response to the electrical probing signal, and determining whether a captured responsive signal has characteristics of an expected responsive pulse, and to output a positive output signal indicative of possible living body to mitigate risks of electrical shock.Type: GrantFiled: November 5, 2018Date of Patent: March 1, 2022Assignee: Vicwood Prosperity Technology LimitedInventors: Ka Wai Eric Cheng, Man Yau Law, Hin Hung Ng, Kwok Shing Wong
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Publication number: 20210409022Abstract: Methods and apparatus for detecting possible living body contact at an electrical contact surface is disclosed, comprising sending a non-hazardous probing signal to the contact surface, detecting an electrical response from the contact surface in response to the electrical probing signal, and determining whether a captured responsive signal has characteristics of an expected responsive pulse, and to output a positive output signal indicative of possible living body to mitigate risks of electrical shock.Type: ApplicationFiled: November 5, 2018Publication date: December 30, 2021Inventors: Ka Wai Eric Cheng, Man Yau Law, Hin Hung Ng, Kwok Shing Wong
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Patent number: 11211795Abstract: An apparatus for monitoring an electrical apparatus, the load monitoring apparatus comprising a controller which is configured to capture and process voltage and current data of an electrical apparatus, which is electrically connected with a power supply, to obtain electrical parameters of the electrical apparatus, to store the electrical parameters as measured electrical parameters, to compare the measured electrical parameters with a set of pre-stored electrical parameters, to determine whether the measured electrical parameters match with the stored electrical parameters, and to operate a power switch to turn off power supply to the electrical parameters if the measured electrical parameters do not match with the stored electrical parameters.Type: GrantFiled: February 26, 2020Date of Patent: December 28, 2021Assignee: Vicwood Prosperity Technology LimitedInventors: Ka Wai Eric Cheng, Man Yau Law, Hin Hung Ng, Kwok Shing Wong
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Publication number: 20210124077Abstract: A method of detecting possible living body contact at an electrical conductive surface, wherein the living body has a contact portion having electrical properties resembling an impedance bridge comprising a plurality of resistors and a plurality of capacitors connected in series and parallel and having a characteristic rise-time and a characteristic fall-time, wherein the impedance bridge comprises a resistor series (R0+R1+R2) having a total resistance value and a resistor-capacitor first RC bridge comprising a parallel connection of a first resistor (C1) having a first resistance value and a first capacitor (R1) having a first capacitance value, and the resistor series (R0+R1+R2) comprises an internal resistor (R0) in series connection with the first RC bridge and having an internal resistance value.Type: ApplicationFiled: May 10, 2019Publication date: April 29, 2021Inventors: Man Yau Law, Hin Hung Ng
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Patent number: 10819340Abstract: A method of detecting possible living body contact at an electrical contact surface, wherein the living body has a detectable characteristic initial impedance and a corresponding characteristic time constant defined by the initial impedance upon touching the electrical contact surface when the electrical contact surface is at a touching voltage, wherein the method comprises sending a non-hazardous probing signal to the contact surface, wherein the probing signal comprises one probing pulse or a plurality of probing pulses forming a probing pulse train, and the probing pulse has a base voltage level and a probing voltage level which is above the base voltage level and equal to the touching voltage or a probing voltage level which is below the base voltage level and equal to the touching voltage; detecting an electrical response from the contact surface in response to the electrical probing signal, wherein the electrical response comprises electrical response signals; and determining from the electrical responsType: GrantFiled: November 3, 2017Date of Patent: October 27, 2020Assignee: VICWOOD PROSPERITY TECHNOLOGY LIMITEDInventors: Ka Wai Eric Cheng, Man Yau Law, Hin Hung Ng
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Publication number: 20200195008Abstract: An apparatus for monitoring an electrical apparatus, the load monitoring apparatus comprising a controller which is configured to capture and process voltage and current data of an electrical apparatus, which is electrically connected with a power supply, to obtain electrical parameters of the electrical apparatus, to store the electrical parameters as measured electrical parameters, to compare the measured electrical parameters with a set of pre-stored electrical parameters, to determine whether the measured electrical parameters match with the stored electrical parameters, and to operate a power switch to turn off power supply to the electrical parameters if the measured electrical parameters do not match with the stored electrical parameters.Type: ApplicationFiled: February 26, 2020Publication date: June 18, 2020Inventors: Ka Wai Eric Cheng, Man Yau Law, Hin Hung Ng, Kwok Shing Wong
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Patent number: 10680530Abstract: A power supply control apparatus comprising a controller, a load current monitor and power connection circuitry operable by the controller for controlling power supply from a power source to a load. The controller is to operate to receive an identification number from a load and to use the identification number to retrieve a set of stored reference electrical parameters of the load from a set of databases, to measure operational electrical parameters of the load, to compare measured electrical parameters with the reference electrical parameters, and to determine whether the load is fit for power supply with reference to outcome of comparison between the measured electrical parameters and the reference electrical parameters.Type: GrantFiled: February 19, 2019Date of Patent: June 9, 2020Assignee: Vicwood Prosperity Technology LimitedInventors: Ka Wai Eric Cheng, Man Yau Law, Hin Hung Ng
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Publication number: 20190363712Abstract: A method of detecting possible living body contact at an electrical contact surface, wherein the living body has a detectable characteristic initial impedance and a corresponding characteristic time constant defined by the initial impedance upon touching the electrical contact surface when the electrical contact surface is at a touching voltage, wherein the method comprises sending a non-hazardous probing signal to the contact surface, wherein the probing signal comprises one probing pulse or a plurality of probing pulses forming a probing pulse train, and the probing pulse has a base voltage level and a probing voltage level which is above the base voltage level and equal to the touching voltage or a probing voltage level which is below the base voltage level and equal to the touching voltage; detecting an electrical response from the contact surface in response to the electrical probing signal, wherein the electrical response comprises electrical response signals; and determining from the electrical responsType: ApplicationFiled: November 3, 2017Publication date: November 28, 2019Inventors: Ka Wai Eric CHENG, Man Yau LAW, Hin Hung NG
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Patent number: 10355473Abstract: A power safety device comprising a controller, a load monitor and switching circuitry, wherein the switching circuitry is operable in a first operation state in which a power supply side and a load side are connected by a lower impedance power conduction path or a second operation state when impedance between the load side and the power supply side is high so that hazardous operation current is prevented from flowing from the power source side, through the switching circuitry, and to the load side, wherein the load monitor comprises circuit arrangements to determine and/or monitor load condition on the load side and the controller is to operate the switching circuitry to operate in the first operation state upon detection of a non-hazardous load condition or a predetermined safe load condition on the load side.Type: GrantFiled: April 29, 2016Date of Patent: July 16, 2019Assignee: ETON SOLUTIONS LIMITEDInventors: Man Yau Law, Hin Hung Ng
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Publication number: 20190190395Abstract: A power supply control apparatus comprising a controller, a load current monitor and power connection circuitry operable by the controller for controlling power supply from a power source to a load. The controller is to operate to receive an identification number from a load and to use the identification number to retrieve a set of stored reference electrical parameters of the load from a set of databases, to measure operational electrical parameters of the load, to compare measured electrical parameters with the reference electrical parameters, and to determine whether the load is fit for power supply with reference to outcome of comparison between the measured electrical parameters and the reference electrical parameters.Type: ApplicationFiled: February 19, 2019Publication date: June 20, 2019Inventors: Ka Wai Eric Cheng, Man Yau Law, Hin Hung Ng
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Patent number: 10211623Abstract: A power supply control device comprises a controller and power connection circuitry. The power connection circuitry comprises a switchable power connection path between a source side and a load side. The power connection path is switchable to operate in a first operation state or an on-state in which state impedance between the source side and the load side is very low to permit flow of operation current through the power connection path, or a second operation state or an off-state in which state impedance between the source side and the load side is very high to impede flow of operation current through the power connection path. The controller is to operate to transmit at least one type of enquiry signals to the load side and to determine with reference to at least one type of received responsive signals whether a load on the load side is eligible for power supply connection.Type: GrantFiled: May 2, 2016Date of Patent: February 19, 2019Assignee: Eton Solutions LimitedInventors: Ka Wai Eric Cheng, Man Yau Law, Hin Hung Ng
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Publication number: 20180294639Abstract: A power safety device comprising a controller, a load monitor and switching circuitry, wherein the switching circuitry is operable in a first operation state in which a power supply side and a load side are connected by a lower impedance power conduction path or a second operation state when impedance between the load side and the power supply side is high so that hazardous operation current is prevented from flowing from the power source side, through the switching circuitry, and to the load side, wherein the load monitor comprises circuit arrangements to determine and/or monitor load condition on the load side and the controller is to operate the switching circuitry to operate in the first operation state upon detection of a non-hazardous load condition or a predetermined safe load condition on the load side.Type: ApplicationFiled: April 29, 2016Publication date: October 11, 2018Inventors: Man Yau LAW, Hin Hung NG
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Publication number: 20180152015Abstract: A power supply control device comprises a controller and power connection circuitry. The power connection circuitry comprises a switchable power connection path between a source side and a load side. The power connection path is switchable to operate in a first operation state or an on-state in which state impedance between the source side and the load side is very low to permit flow of operation current through the power connection path, or a second operation state or an off-state in which state impedance between the source side and the load side is very high to impede flow of operation current through the power connection path. The controller is to operate to transmit at least one type of enquiry signals to the load side and to determine with reference to at least one type of received responsive signals whether a load on the load side is eligible for power supply connection.Type: ApplicationFiled: May 2, 2016Publication date: May 31, 2018Inventors: Ka Wai Eric CHENG, Man Yau LAW, Hin Hung NG