Patents by Inventor Chen Kok Yeoh

Chen Kok Yeoh 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).

  • Patent number: 11843127
    Abstract: A battery, method and battery operated portable communication device are provided with protection from excessive current and thermal conditions. A plurality of protection circuits are coupled in series within a common charge/discharge path of the battery. The first protection circuit is configured to block current by opening a switch in response to a voltage drop across the switch and a current sense resistor in the common charge/discharge path. The second protection circuit provides redundancy under conditions where the first switch might fail, where the second switch will block current through the current sense resistor.
    Type: Grant
    Filed: June 11, 2021
    Date of Patent: December 12, 2023
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Muhamad Ridzuan Azizan, Kow Chee Chong, Md Reduan Md Saad, Chen Kok Yeoh, Macwien Krishnamurthi
  • Publication number: 20230208163
    Abstract: An example system comprises a battery and a battery-powered device. Battery contacts and a data interface are therebetween. The battery includes low-power and high-power circuits to output power, from a cell, to the battery-powered device via the contacts. The high-power circuit outputs power higher than the low-power circuit. A switch(es) connects and disconnects the high-power circuit to/from the contacts, the low-power circuit connected to the contacts when the switch disconnects the high-power circuit. A voltage detector: detects a battery-voltage on the contacts and an output voltage on the data interface; when the output voltage is greater than the battery-voltage, controls the switch to connect the high-power circuit to the contacts; and when the output voltage is below the battery-voltage, controls the switch to disconnect the high-power circuit from the contacts. The battery-powered device provides the output voltage on the data interface as powered from the contacts by the battery.
    Type: Application
    Filed: December 24, 2021
    Publication date: June 29, 2023
    Inventors: Muhamad Ridzuan AZIZAN, Kow Chee CHONG, Macwien KRISHNAMURHTI, Wai Mun LEE, Chen Kok YEOH, Yik Chuang Joseph TING
  • Publication number: 20220399614
    Abstract: A battery, method and battery operated portable communication device are provided with protection from excessive current and thermal conditions. A plurality of protection circuits are coupled in series within a common charge/discharge path of the battery. The first protection circuit is configured to block current by opening a switch in response to a voltage drop across the switch and a current sense resistor in the common charge/discharge path. The second protection circuit provides redundancy under conditions where the first switch might fail, where the second switch will block current through the current sense resistor.
    Type: Application
    Filed: June 11, 2021
    Publication date: December 15, 2022
    Inventors: MUHAMAD RIDZUAN AZIZAN, KOW CHEE CHONG, MD REDUAN MD SAAD, CHEN KOK YEOH, MACWIEN KRISHNAMURTHI
  • Patent number: 11502520
    Abstract: A battery module includes a first load terminal, a second load terminal, a first charger terminal, a charger enable terminal, and a battery having a first battery terminal coupled to the first load terminal and a second terminal coupled to the second load terminal. A first isolation device is coupled between the first load terminal and the first charger terminal and has an enable terminal coupled to the charger enable terminal. A first protection circuit includes a second isolation device coupled between the second battery terminal and the second load terminal and a first sensing circuit configured to enable the second isolation device responsive to detecting a failure of the first isolation device.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: November 15, 2022
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Muhamad Ridzuan Azizan, Abdul Rashid Abdul Halim, Friedrich Bollmann, Kow Chee Chong, Jeevan Kanesalingam, Macwien Krishnamurthi, Chen Kok Yeoh
  • Patent number: 11387645
    Abstract: An apparatus and method for providing a selectively reduced voltage to a portable electronic device are disclosed. When a determination is made that an output voltage from a voltage source exceeds a predefined maximum permitted voltage, a plurality of circuitries, including an adaptive active current limiting circuitry, are enabled in order to derive the reduced voltage from the output voltage. The reduced voltage is at least at or below the predefined maximum permitted voltage and is supplied to the portable electronic device by battery circuitry that includes the active current limiting circuitry.
    Type: Grant
    Filed: May 8, 2020
    Date of Patent: July 12, 2022
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Muhamad Ridzuan Azizan, Chen Kok Yeoh, Wai Mun Lee, Mohd Faisal Abdullah, Kow Chee Chong, Macwien Krishnamurthi
  • Patent number: 11264814
    Abstract: Battery circuitry forms part of apparatus for connecting a battery power source to a portable electronic device. The battery circuitry is configured to detect a transitioning of an enable signal, caused by actuation of a power switch, from a de-asserted state to an asserted state. In response to detecting the transitioning of the enable signal, the battery circuitry is further configured to open an electrical path within the battery circuitry. The path, when opened, connects the battery power source in a manner that permits powering on of the portable electronic device.
    Type: Grant
    Filed: May 8, 2020
    Date of Patent: March 1, 2022
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Muhamad Ridzuan Azizan, Chen Kok Yeoh, Wai Mun Lee, Mohd Faisal Abdullah, Kow Chee Chong, Macwien Krishnamurthi
  • Patent number: 11211785
    Abstract: A method for dynamic limiting of battery voltage includes determining that a voltage delivered by a battery exceeds a predefined maximum safe voltage for operation of a portable electronic device in a hazardous environment and, in response, enabling a voltage restriction circuit in a supply line between the battery and the portable electronic device to reduce the voltage delivered by the battery below the maximum safe voltage, and supplying electrical power to the portable electronic device at the reduced voltage. Enabling the voltage restriction circuit may include deactivating a MOSFET switch that includes a forward biased body diode to allow the body diode to provide a fixed voltage drop. The method also includes determining that the voltage delivered by the battery no longer exceeds the maximum safe voltage and, in response, disabling the first voltage restriction circuit by activating the MOSFET, thus allowing the body diode to be bypassed.
    Type: Grant
    Filed: October 2, 2019
    Date of Patent: December 28, 2021
    Assignee: Motorola Solutions, Inc.
    Inventors: Wai Mun Lee, Macwien Krishnamurthi, Chen Kok Yeoh, Kow Chee Chong, Muhamad Ridzuan Azizan
  • Publication number: 20210351600
    Abstract: Battery circuitry forms part of apparatus for connecting a battery power source to a portable electronic device. The battery circuitry is configured to detect a transitioning of an enable signal, caused by actuation of a power switch, from a de-asserted state to an asserted state. In response to detecting the transitioning of the enable signal, the battery circuitry is further configured to open an electrical path within the battery circuitry. The path, when opened, connects the battery power source in a manner that permits powering on of the portable electronic device.
    Type: Application
    Filed: May 8, 2020
    Publication date: November 11, 2021
    Inventors: MUHAMAD RIDZUAN AZIZAN, CHEN KOK YEOH, WAI MUN LEE, MOHD FAISAL ABDULLAH, KOW CHEE CHONG, MACWIEN KRISHNAMURTHI
  • Publication number: 20210351586
    Abstract: An apparatus and method for providing a selectively reduced voltage to a portable electronic device are disclosed. When a determination is made that an output voltage from a voltage source exceeds a predefined maximum permitted voltage, a plurality of circuitries, including an adaptive active current limiting circuitry, are enabled in order to derive the reduced voltage from the output voltage. The reduced voltage is at least at or below the predefined maximum permitted voltage and is supplied to the portable electronic device by battery circuitry that includes the active current limiting circuitry.
    Type: Application
    Filed: May 8, 2020
    Publication date: November 11, 2021
    Inventors: MUHAMAD RIDZUAN AZIZAN, CHEN KOK YEOH, WAI MUN LEE, MOHD FAISAL ABDULLAH, KOW CHEE CHONG, MACWIEN KRISHNAMURTHI
  • Publication number: 20210265847
    Abstract: A battery module includes a first load terminal, a second load terminal, a first charger terminal, a charger enable terminal, and a battery having a first battery terminal coupled to the first load terminal and a second terminal coupled to the second load terminal. A first isolation device is coupled between the first load terminal and the first charger terminal and has an enable terminal coupled to the charger enable terminal. A first protection circuit includes a second isolation device coupled between the second battery terminal and the second load terminal and a first sensing circuit configured to enable the second isolation device responsive to detecting a failure of the first isolation device.
    Type: Application
    Filed: February 24, 2020
    Publication date: August 26, 2021
    Inventors: Muhamad Ridzuan Azizan, Abdul Rashid Abdul Halim, Friedrich Bollmann, Kow Chee Chong, Jeevan Kanesalingam, Macwien Krishnamurthi, Chen Kok Yeoh
  • Patent number: 11088531
    Abstract: A device, battery and method for spark detection based on transient currents is provided. The battery includes: a cell; an interface; a first protection circuit and a second protection circuit. The first protection circuit comprises a first switch between the cell and the interface. The second protection circuit comprises a second switch between the cell and the interface. The first protection circuit is configured to: measure a load current on the cell; and open the first switch according to a first delay time based on the measurement of the load current. The second protection circuit is configured to: measure a transient current on the cell above the load current; and open the second switch according to a second delay time, lower than the first delay time, based on the measurement of the transient current.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: August 10, 2021
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Muhamad Ridzuan Azizan, Macwien Krishnamurhti, Kow Chee Chong, Chen Kok Yeoh
  • Publication number: 20210104886
    Abstract: A method for dynamic limiting of battery voltage includes determining that a voltage delivered by a battery exceeds a predefined maximum safe voltage for operation of a portable electronic device in a hazardous environment and, in response, enabling a voltage restriction circuit in a supply line between the battery and the portable electronic device to reduce the voltage delivered by the battery below the maximum safe voltage, and supplying electrical power to the portable electronic device at the reduced voltage. Enabling the voltage restriction circuit may include deactivating a MOSFET switch that includes a forward biased body diode to allow the body diode to provide a fixed voltage drop. The method also includes determining that the voltage delivered by the battery no longer exceeds the maximum safe voltage and, in response, disabling the first voltage restriction circuit by activating the MOSFET, thus allowing the body diode to be bypassed.
    Type: Application
    Filed: October 2, 2019
    Publication date: April 8, 2021
    Inventors: Wai Mun Lee, Macwien Krishnamurthi, Chen Kok Yeoh, Kow Chee Chong, Muhamad Ridzuan Azizan
  • Publication number: 20210075206
    Abstract: A device, battery and method for spark detection based on transient currents is provided. The battery includes: a cell; an interface; a first protection circuit and a second protection circuit. The first protection circuit comprises a first switch between the cell and the interface. The second protection circuit comprises a second switch between the cell and the interface. The first protection circuit is configured to: measure a load current on the cell; and open the first switch according to a first delay time based on the measurement of the load current. The second protection circuit is configured to: measure a transient current on the cell above the load current; and open the second switch according to a second delay time, lower than the first delay time, based on the measurement of the transient current.
    Type: Application
    Filed: September 6, 2019
    Publication date: March 11, 2021
    Inventors: Muhamad Ridzuan AZIZAN, Macwien KRISHNAMURHTI, Kow Chee CHONG, Chen Kok YEOH
  • Patent number: 10368167
    Abstract: An apparatus and method for controlling an audio power circuit. The audio power circuit includes an audio amplifier having a power input and a speaker connected to the audio amplifier. The audio power circuit also includes a control circuit configured to be connected to a battery and the power input and to control a supply of power to the power input. The audio power circuit further includes a thermal protection circuit connected between the audio amplifier and the speaker, the thermal protection circuit configured to generate a thermal protection signal and provide the same to the control circuit, wherein the control circuit is further configured to control the supply of power based on the thermal protection signal.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: July 30, 2019
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Chen Kok Yeoh, Joo Yih See, Chin Seng Tan
  • Publication number: 20180152785
    Abstract: An apparatus and method for controlling an audio power circuit. The audio power circuit includes an audio amplifier having a power input and a speaker connected to the audio amplifier. The audio power circuit also includes a control circuit configured to be connected to a battery and the power input and to control a supply of power to the power input. The audio power circuit further includes a thermal protection circuit connected between the audio amplifier and the speaker, the thermal protection circuit configured to generate a thermal protection signal and provide the same to the control circuit, wherein the control circuit is further configured to control the supply of power based on the thermal protection signal.
    Type: Application
    Filed: November 28, 2016
    Publication date: May 31, 2018
    Inventors: Chen Kok Yeoh, Joo Yih See, Chin Seng Tan
  • Publication number: 20170117738
    Abstract: A method and apparatus for visually indicating battery pack information related to wirelessly charging a battery pack via a wireless charging mat. The method includes uniquely associating, with a controller of the wireless charging mat, each visual indicator of a first plurality of visual indicators on the wireless charging mat with one of a first plurality of sensors on the wireless charging mat. The method further includes receiving the battery pack information from the battery pack with one or more of the first plurality of sensors. The method further includes wirelessly charging the battery pack using the wireless charging mat, and illuminating the first plurality of visual indicators based on the battery pack information.
    Type: Application
    Filed: October 26, 2015
    Publication date: April 27, 2017
    Inventors: Chen Kok Yeoh, William B. Kiger, Macwien Krishnamurthi, Chin Wun Ng, Cheah Heng Tan, Mun Yew Tham
  • Patent number: 9450636
    Abstract: An intrinsically safe audio power circuit includes redundant electronic fuses disposed between the power input of an audio power amplifier and the battery source of the portable two-way radio device. The electronic fuse circuits are connected in series with each other, and each electronic fuse circuit includes a series switch transistor that can shut off the flow of current between the battery and the audio power amplifier. Each electronic fuse circuit also includes a current sense portion, and when the current through the electronic fuse circuits reaches a current threshold, it will shut off its series switch transistor using an active bias circuit in order to ensure sufficiently rapid shut off.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: September 20, 2016
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Chen Kok Yeoh, Friedrich Josef Bollmann, Geng Xiang Lee @ Titus Lee, Joo Yih See
  • Publication number: 20160191104
    Abstract: An intrinsically safe audio power circuit includes redundant electronic fuses disposed between the power input of an audio power amplifier and the battery source of the portable two-way radio device. The electronic fuse circuits are connected in series with each other, and each electronic fuse circuit includes a series switch transistor that can shut off the flow of current between the battery and the audio power amplifier. Each electronic fuse circuit also includes a current sense portion, and when the current through the electronic fuse circuits reaches a current threshold, it will shut off its series switch transistor using an active bias circuit in order to ensure sufficiently rapid shut off.
    Type: Application
    Filed: December 30, 2014
    Publication date: June 30, 2016
    Inventors: CHEN KOK YEOH, FRIEDRICH JOSEF BOLLMANN, GENG XIANG LEE @ TITUS LEE, JOO YIH SEE
  • Patent number: 8135364
    Abstract: Communication equipment includes a circuit generating an RF input signal; a PA receiving a supply voltage, receiving the RF input signal, and providing an amplified version of the RF input signal as an output signal that is associated with an output power of the communication equipment; and an output circuit that includes an antenna for transmitting the output signal. The communication equipment also includes: a voltage detector circuit including sensing circuitry for sensing the supply voltage and a comparator for comparing the supply voltage to a first voltage threshold and generating a control signal when the supply voltage exceeds the first voltage threshold; and a disabling circuit coupled to the voltage detection circuit for disabling a portion of the communication equipment in response to the control signal to maintain output power of the communication equipment below a maximum output power level.
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: March 13, 2012
    Assignee: Motorola Solutions, Inc.
    Inventors: Chin Wun Ng, Chen Kok Yeoh, Siew Yin Lee
  • Publication number: 20100041354
    Abstract: Communication equipment includes a circuit generating an RF input signal; a PA receiving a supply voltage, receiving the RF input signal, and providing an amplified version of the RF input signal as an output signal that is associated with an output power of the communication equipment; and an output circuit that includes an antenna for transmitting the output signal. The communication equipment also includes: a voltage detector circuit including sensing circuitry for sensing the supply voltage and a comparator for comparing the supply voltage to a first voltage threshold and generating a control signal when the supply voltage exceeds the first voltage threshold; and a disabling circuit coupled to the voltage detection circuit for disabling a portion of the communication equipment in response to the control signal to maintain output power of the communication equipment below a maximum output power level.
    Type: Application
    Filed: August 5, 2009
    Publication date: February 18, 2010
    Applicant: Motorola, Inc.
    Inventors: Chin Wun Ng, Chen Kok Yeoh, Siew Yin Lee