Patents by Inventor Wing Ling Cheng
Wing Ling Cheng 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: 10320279Abstract: An example switched-mode power supply includes an input for receiving an input voltage from a voltage source, an output for providing an output voltage to a load, and a transformer having a primary winding, a secondary winding, and a conductive shield disposed between the primary winding and the secondary winding. The power supply also includes a neutralization signal generator circuit coupled to the conductive shield to apply a neutralization signal to the conductive shield to reduce a common mode noise between the primary winding and the secondary winding of the transformer. The neutralization signal has an adjustable amplitude and/or phase. Other example power supplies and methods are also disclosed.Type: GrantFiled: December 2, 2015Date of Patent: June 11, 2019Assignee: Astec International LimitedInventors: Wing Ling Cheng, Yuk Man Shing
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Patent number: 10056756Abstract: Audio Frequency Load Control (AFLC) signal processing electronics added to a power factor correction (PFC) unit allowing the AFLC system to operate without the need of large and heavy passive bypass or blocking filters at the PFC installations. The AFLC signal processing electronics a first group of additional electronics tuned to the AFLC frequency for detecting the AFLC carrier signal; and a second group of additional electronics for driving an AFLC impedance switch that is connected in parallel with an AFLC impedance. The AFLC impedance is connected in series with the PFC capacitors, and is sufficiently large to offer significant impedance in series with the PFC capacitors that allows the AFLC signal to bypass the PFC unit.Type: GrantFiled: March 1, 2016Date of Patent: August 21, 2018Assignee: EDGE ELECTRONS LIMITEDInventors: Neal George Stewart, Wing Ling Cheng
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Patent number: 10027120Abstract: A high-efficiency system for conducting power factor (PF) and harmonics correction in an electrical network, comprising a controller; a digital PFC capacitor array comprising two or more passive PFC capacitors, providing fine steps increments in the PF correction; and linear PFC capacitor arrays, providing coarse steps increments in the PF correction. The PF correction in coarse steps increments and fine steps increments allow a total or near total PF correction without overcompensation. Optionally, the system further comprises a lower power active power filter (APF) configured to only target and eliminate or minimize harmonics in the electrical network.Type: GrantFiled: December 4, 2017Date of Patent: July 17, 2018Assignee: EDGE ELECTRONS LIMITEDInventors: Jian Carlo Decena Zapata, Efren II Santos Cruzat, Neal George Stewart, Gordon Currie, Wing Ling Cheng
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Patent number: 9979312Abstract: An energy saving alternate current (AC) series voltage regulator comprises an AC high frequency (HF) series voltage buck power regulator, a bypass contactor (K1), a bidirectional AC semiconductor device (S1) connected in parallel with the bypass contactor and a control circuitry. Under the condition of an input AC mains voltage (Vin) drops below a specified and set optimum energy savings voltage or a lower selected voltage point, the control circuitry transitions both the slow bypass contactor and the fast bidirectional AC semiconductor device, then the AC high frequency (HF) series voltage buck power regulator are switched out to save the AC high frequency (HF) series voltage buck power regulator internal power electronics usage. Under this condition, the lower input AC mains voltage is directly delivered to an electrical load by the contactor bypass system, hence achieving more energy savings.Type: GrantFiled: January 12, 2015Date of Patent: May 22, 2018Assignee: Edge Electrons LimitedInventors: Neal George Stewart, Wing Ling Cheng
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Patent number: 9941698Abstract: Legacy automatic variable capacitor KVAR compensation systems typically use either electromechanical devices such as relays or contactors of various forms and types to switch the selected capacitors in and out of the electrical system under some form of electronic control. These systems are slow and discontinuous in their ability to closely regulate the exact value of compensatory capacitance needed to compensate the variable and rapidly changing reactive power KVAR in the electrical power transmission and distribution networks. The present invention provides a fast response active KVAR compensator based on a variable transimpedance topology.Type: GrantFiled: January 6, 2016Date of Patent: April 10, 2018Assignee: Edge Electronics LimitedInventors: Neal George Stewart, Wing Ling Cheng
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Publication number: 20180041034Abstract: Audio Frequency Load Control (AFLC) signal processing electronics added to a power factor correction (PFC) unit allowing the AFLC system to operate without the need of large and heavy passive bypass or blocking filters at the PFC installations. The AFLC signal processing electronics a first group of additional electronics tuned to the AFLC frequency for detecting the AFLC carrier signal; and a second group of additional electronics for driving an AFLC impedance switch that is connected in parallel with an AFLC impedance. The AFLC impedance is connected in series with the PFC capacitors, and is sufficiently large to offer significant impedance in series with the PFC capacitors that allows the AFLC signal to bypass the PFC unit.Type: ApplicationFiled: March 1, 2016Publication date: February 8, 2018Inventors: Neal George Stewart, Wing Ling CHENG
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Publication number: 20170373499Abstract: Legacy automatic variable capacitor KVAR compensation systems typically use either electromechanical devices such as relays or contactors of various forms and types to switch the selected capacitors in and out of the electrical system under some form of electronic control. These systems are slow and discontinuous in their ability to closely regulate the exact value of compensatory capacitance needed to compensate the variable and rapidly changing reactive power KVAR in the electrical power transmission and distribution networks. The present invention provides a fast response active KVAR compensator based on a variable transimpedance topology.Type: ApplicationFiled: January 6, 2016Publication date: December 28, 2017Inventors: Neal George Stewart, Wing Ling CHENG
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Patent number: 9819279Abstract: An AC voltage regulator that regulates the output AC voltage level regardless of the varying AC input voltage utilizing high frequency series inductors that only process a proportion of the total output power and uses unipolar semiconductor low loss switches in series with one or more rectifiers.Type: GrantFiled: April 11, 2016Date of Patent: November 14, 2017Assignee: EDGE ELECTRONS LIMITEDInventors: Neal George Stewart, Wing Ling Cheng
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Publication number: 20170163145Abstract: An example switched-mode power supply includes an input for receiving an input voltage from a voltage source, an output for providing an output voltage to a load, and a transformer having a primary winding, a secondary winding, and a conductive shield disposed between the primary winding and the secondary winding. The power supply also includes a neutralization signal generator circuit coupled to the conductive shield to apply a neutralization signal to the conductive shield to reduce a common mode noise between the primary winding and the secondary winding of the transformer. The neutralization signal has an adjustable amplitude and/or phase. Other example power supplies and methods are also disclosed.Type: ApplicationFiled: December 2, 2015Publication date: June 8, 2017Inventors: Wing Ling CHENG, Yuk Man SHING
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Publication number: 20170141692Abstract: An energy saving alternate current (AC) series voltage regulator comprises an AC high frequency (HF) series voltage buck power regulator, a bypass contactor (K1), a bidirectional AC semiconductor device (S1) connected in parallel with the bypass contactor and a control circuitry. Under the condition of an input AC mains voltage (Vin) drops below a specified and set optimum energy savings voltage or a lower selected voltage point, the control circuitry transitions both the slow bypass contactor and the fast bidirectional AC semiconductor device, then the AC high frequency (HF) series voltage buck power regulator are switched out to save the AC high frequency (HF) series voltage buck power regulator internal power electronics usage. Under this condition, the lower input AC mains voltage is directly delivered to an electrical load by the contactor bypass system, hence achieving more energy savings.Type: ApplicationFiled: January 12, 2015Publication date: May 18, 2017Applicant: Edge Electrons LimitedInventors: Neal George Stewart, Wing Ling Cheng
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Patent number: 9621020Abstract: A control circuit for controlling a switching device having a first terminal, a second terminal, and a control terminal is disclosed. The control circuit includes a first diode for coupling to the first terminal of the switching device, a second diode for coupling to the second terminal of the switching device, a first transistor for coupling to the control terminal of the switching device, and a second transistor coupled to the second diode. The first transistor is coupled to the first diode. The control circuit is configured to allow current flow in only one direction between the first and second terminals of the switching device.Type: GrantFiled: May 16, 2008Date of Patent: April 11, 2017Assignee: ASTEC INTERNATIONAL LIMITEDInventors: Zong Bo Hu, Ying Qu, Kevin Donald Wildash, Wai Kin Chan, Wing Ling Cheng
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Publication number: 20160218635Abstract: An AC voltage regulator that regulates the output AC voltage level regardless of the varying AC input voltage utilizing high frequency series inductors that only process a proportion of the total output power and uses unipolar semiconductor low loss switches in series with one or more rectifiers.Type: ApplicationFiled: April 11, 2016Publication date: July 28, 2016Inventors: Neal George Stewart, Wing Ling Cheng
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Patent number: 9219413Abstract: A power supply includes a power circuit for converting an input voltage or current to an output voltage or current, at least one interface port for receiving signals from one or more external devices, and a control circuit coupled to the power circuit and the at least one interface port. The control circuit is adapted to operate the power circuit in response to control signals having a plurality of different control signal formats that are received by the at least one interface port.Type: GrantFiled: May 10, 2012Date of Patent: December 22, 2015Assignee: ASTEC INTERNATIONAL LIMITEDInventors: Wing Ling Cheng, Conor Quinn
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Patent number: 9148058Abstract: A bidirectional AC series voltage regulator that regulates an output AC voltage level regardless of the varying AC input voltage utilizing high frequency series inductors that only process a proportion of the total output power. The AC series voltage regulator detects the power inductor current direction data signal and can generate power inductor current direction data signals for its control to determine the AC input voltage polarity at all time; wherein the determination of the AC input voltage polarity is unambiguous during the AC input voltage zero crossover and near zero points; and wherein the determination of the AC input voltage polarity allows normal switching sequence of the AC bidirectional switches during the AC input voltage zero crossover and near zero points to prevent power “shoot-through.Type: GrantFiled: October 28, 2014Date of Patent: September 29, 2015Assignee: Power Quality Engineering LimitedInventors: Neal George Stewart, Wing Ling Cheng
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Patent number: 9124180Abstract: A resonant converter apparatus includes a plurality of resonant converters connected in parallel, and a control module outputting a pulse width modulation (PWM) control signal to the resonant converters. The control module includes a voltage control loop and a circuit control loop. The voltage control loop compares the sensed output voltage with a predetermined reference voltage, and outputs a PWM control signal to one of the resonant converters so the output voltage of the one converter is equal to the predetermined reference voltage. The current control loop uses the sensed output current of the one converter as a reference current, compares the reference current with the sensed output current from each of the other resonant converters, generates a frequency adjusting variable, and calculates the individual PWM control signal for each of the other converters so the output currents of the plurality of converters are the same.Type: GrantFiled: March 14, 2012Date of Patent: September 1, 2015Assignee: ASTEC INTERNATIONAL LIMITEDInventors: Tai Keung Lee, Wing Ling Cheng, Xiao Fen Zhong, Yi Cai
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Publication number: 20150115913Abstract: A bidirectional AC series voltage regulator that regulates an output AC voltage level regardless of the varying AC input voltage utilizing high frequency series inductors that only process a proportion of the total output power. The AC series voltage regulator detects the power inductor current direction data signal and can generate power inductor current direction data signals for its control to determine the AC input voltage polarity at all time; wherein the determination of the AC input voltage polarity is unambiguous during the AC input voltage zero crossover and near zero points; and wherein the determination of the AC input voltage polarity allows normal switching sequence of the AC bidirectional switches during the AC input voltage zero crossover and near zero points to prevent power “shoot-through.Type: ApplicationFiled: October 28, 2014Publication date: April 30, 2015Inventors: Neal George STEWART, Wing Ling CHENG
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Publication number: 20130221944Abstract: A power supply includes a power circuit for converting an input voltage or current to an output voltage or current, at least one interface port for receiving signals from one or more external devices, and a control circuit coupled to the power circuit and the at least one interface port. The control circuit is adapted to operate the power circuit in response to control signals having a plurality of different control signal formats that are received by the at least one interface port.Type: ApplicationFiled: May 10, 2012Publication date: August 29, 2013Inventors: Wing Ling Cheng, Conor Quinn
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Publication number: 20120236610Abstract: A resonant converter apparatus includes a plurality of resonant converters connected in parallel, and a control module outputting a pulse width modulation (PWM) control signal to the resonant converters. The control module includes a voltage control loop and a circuit control loop. The voltage control loop compares the sensed output voltage with a predetermined reference voltage, and outputs a PWM control signal to one of the resonant converters so the output voltage of the one converter is equal to the predetermined reference voltage. The current control loop uses the sensed output current of the one converter as a reference current, compares the reference current with the sensed output current from each of the other resonant converters, generates a frequency adjusting variable, and calculates the individual PWM control signal for each of the other converters so the output currents of the plurality of converters are the same.Type: ApplicationFiled: March 14, 2012Publication date: September 20, 2012Inventors: Tai Keung Lee, Wing Ling Cheng, Xiao Fen Zhong, Yi Cai
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Patent number: 8207779Abstract: A control circuit for controlling a switching device having a first terminal, a second terminal, and a control terminal is disclosed. The control circuit includes a first diode for coupling to the first terminal of the switching device, a second diode for coupling to the second terminal of the switching device, a first transistor for coupling to the control terminal of the switching device, and a second transistor coupled to the second diode. The first transistor is coupled to the first diode. The control circuit is configured to allow current flow in only one direction between the first and second terminals of the switching device.Type: GrantFiled: May 16, 2008Date of Patent: June 26, 2012Assignee: Astec International LimitedInventors: Zong Bo Hu, Ying Qu, Kevin Donald Wildash, Wai Kin Chan, Wing Ling Cheng
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Patent number: 7830269Abstract: A method for detecting a performance degradation of a capacitor in a power converter is disclosed. The method includes monitoring a voltage across the capacitor, detecting the performance degradation of the capacitor based on the monitored voltage, and generating a warning signal after detecting the performance degradation of the capacitor. A power converter is including at least one capacitor and a processor operably coupled to the at least one capacitor for monitoring a voltage across the at least one capacitor is also disclosed. The processor is configured for detecting a performance degradation of the capacitor based, at least in part, on the monitored voltage, and for generating a warning signal after detecting the performance degradation of the at least one capacitor.Type: GrantFiled: September 14, 2007Date of Patent: November 9, 2010Assignee: Astec International LimitedInventors: Wing Ling Cheng, Zhe Wang, Huai Gang Jiang, Lin Guo Wang