Patents by Inventor Man Hay Pong
Man Hay Pong 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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Publication number: 20240146297Abstract: A gate driving device includes an operational amplifier, two impedances, a multiplexer, and an UVLO circuit. The operational amplifier has an output coupled to the gate of the SiC MOSFET, a positive power terminal coupled to a positive power rail, and a negative power terminal coupled to a negative power rail. The impedances are coupled in series and coupled between the output of the amplifier and a low-voltage terminal. The UVLO circuit is coupled to the multiplexer and the positive power rail and coupled to the positive power voltage of the positive power rail, a driving voltage, and an UVLO voltage. The UVLO circuit controls the multiplexer to transmit an off voltage or an on voltage to the positive input of the operational amplifier based on the positive power voltage, the driving voltage, and the UVLO voltage, thereby turning on or off the SiC MOSFET.Type: ApplicationFiled: October 28, 2022Publication date: May 2, 2024Applicant: Taipei ANJET CorporationInventors: Man Hay PONG, Wen-Chin Wu
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Patent number: 11962292Abstract: A gate driving device includes an operational amplifier, two impedances, a multiplexer, and an UVLO circuit. The operational amplifier has an output coupled to the gate of the SiC MOSFET, a positive power terminal coupled to a positive power rail, and a negative power terminal coupled to a negative power rail. The impedances are coupled in series and coupled between the output of the amplifier and a low-voltage terminal. The UVLO circuit is coupled to the multiplexer and the positive power rail and coupled to the positive power voltage of the positive power rail, a driving voltage, and an UVLO voltage. The UVLO circuit controls the multiplexer to transmit an off voltage or an on voltage to the positive input of the operational amplifier based on the positive power voltage, the driving voltage, and the UVLO voltage, thereby turning on or off the SiC MOSFET.Type: GrantFiled: October 28, 2022Date of Patent: April 16, 2024Assignee: TAIPEI ANJET CORPORATIONInventors: Man Hay Pong, Wen-Chin Wu
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Publication number: 20210155457Abstract: An elevator system contains a plurality of cars; a twin channel vertical hoistway, a first channel for ascending movement and a second descending movement; and a plurality of horizontal connecting passages between the twin channel vertical hoistway. Sprocket and wheel system mounted in vertical hoistway move cars vertically. Rotatable disc coupled to levers move cars in horizontal connecting passages. Electrical system coupling motors for vertical hoisways enables energy exchange between ascending and descending cars.Type: ApplicationFiled: November 26, 2019Publication date: May 27, 2021Inventors: Man Hay PONG, Albert Ting Pat SO
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Patent number: 8412486Abstract: Subject matter disclosed herein may relate to monitoring and/or estimating remaining life for a power converter.Type: GrantFiled: November 19, 2009Date of Patent: April 2, 2013Assignee: The University of Hong KongInventors: Man Hay Pong, Hon Man Pang
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Publication number: 20100277077Abstract: The present invention is an apparatus to enhance the Life of LED devices in an LED matrix for illumination. It comprises of a spare LED matrix in addition to a main LED matrix. It further comprises of a constant current source which is the power source. Such constant current source is coupled directly to said main LED matrix and powers it up accordingly. In adverse conditions, say when the ambient temperature is high, continuous operation of said main LED matrix at full power will deteriorate the LED life. A power converter coupled to said constant current source operates and draws current to power on said spare LED matrix. This relieves said main LED matrix from full power and the reduction in illumination is largely compensated by said spare LED matrix. This invention further comprises a controller which senses temperature and other parameters and operates said spare LED matrix intelligently. The present invention is also a method to operate said apparatus to maximize LED life or to maximize illumination.Type: ApplicationFiled: April 23, 2010Publication date: November 4, 2010Inventors: Man Hay PONG, Tan Fung LI TAM
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Publication number: 20100125435Abstract: Subject matter disclosed herein may relate to monitoring and/or estimating remaining life for a power converter.Type: ApplicationFiled: November 19, 2009Publication date: May 20, 2010Inventors: Man Hay Pong, Hon May Pang
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Patent number: 7567040Abstract: An efficient power driver for color light emitting diodes (LED) is disclosed for driving multiple LEDs for producing different desired colors. Such LED combinations comprising LEDs with different primary colors are suitable for implementing pixels in displaying a digitized image. This disclosed invention provides switching power conversion embodiments such that a single apparatus drives different color LEDs. Furthermore, the disclosed invention provides configurations with and without input to output isolation while enabling control of the current through each LED, for instance by an inductor or operating condition.Type: GrantFiled: October 24, 2006Date of Patent: July 28, 2009Assignee: The University of Hong KongInventors: Man Hay Pong, Franki Ngai Kit Poon, Joe Chui Pong Liu
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Publication number: 20070040514Abstract: An efficient power driver for color light emitting diodes (LED) is disclosed for driving multiple LEDs for producing different desired colors. Such LED combinations comprising LEDs with different primary colors are suitable for implementing pixels in displaying a digitized image. This disclosed invention provides switching power conversion embodiments such that a single apparatus drives different color LEDs. Furthermore, the disclosed invention provides configurations with and without input to output isolation while enabling control of the current through each LED, for instance by an inductor or operating condition.Type: ApplicationFiled: October 24, 2006Publication date: February 22, 2007Inventors: Man Hay Pong, Franki Poon, Joe Liu
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Patent number: 7178971Abstract: An efficient power driver for color light emitting diodes (LED) is disclosed for driving multiple LEDs for producing different desired colors. Such LED combinations comprising LEDs with different primary colors are suitable for implementing pixels in displaying a digitized image. This disclosed invention provides switching power conversion embodiments such that a single apparatus drives different color LEDs. Furthermore, the disclosed invention provides configurations with and without input to output isolation while enabling control of the current through each LED, for instance by an inductor or operating condition.Type: GrantFiled: December 14, 2001Date of Patent: February 20, 2007Assignee: The University of Hong KongInventors: Man Hay Pong, Franki Ngai Kit Poon, Joe Chui Pong Liu
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Patent number: 7122972Abstract: An AC to AC power conversion apparatus with constant power feeding characteristics to fluorescent lamp or FD lamp is described. The constant power characteristic is achieved by discontinuous mode operation of capacitor coupled in series with the load. Packets of energy are pumped out to the load in each switching cycle, regardless of the resonant characteristics. The dependence of the input power on the square of the supply voltage make the input resistive and produces good power factor automatically. The lamp load is dimmable by external phase control dimmer like resistive incandescent lamps. Multiple lamp loads with different power rating can be integrated by adding more sets of said capacitors and associated components.Type: GrantFiled: March 10, 2004Date of Patent: October 17, 2006Assignee: University of Hong KongInventors: Franki Ngai Kit Poon, Man Hay Pong, Joe Chiu Pong Liu
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Patent number: 6815937Abstract: A fast transient response converter is disclosed which makes use of stepping inductor in a switching converter to speed up output voltage response under fast transient condition. The inductive element in a switching converter is replaced by two series or parallel inductive elements, one of which has a smaller value of inductance than the other. During the fast transient period, the inductor with larger inductance value will be shorted to a voltage source. The total inductance will be greatly reduced and thus allows rapid current change during the transient change.Type: GrantFiled: October 24, 2002Date of Patent: November 9, 2004Assignee: The University of Hong KongInventors: Franki Ngai Kit Poon, Man Hay Pong, Joe Chui Pong Liu
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Patent number: 6812679Abstract: A power converter includes a boost converter, a DC/DC converter and a coupler chain. The boost converter receives a rectified AC input and generates a high voltage output. The boost converter includes a zero-voltage-switching transistor that is operable to adjust the power factor of the rectified AC input to generate the high voltage output. The DC/DC converter is coupled to the high voltage output of the boost converter and is configured to generate a regulated output voltage. The DC/DC converter includes a complementary pair of zero-voltage-switching transistors that are operable to regulate the high voltage output of the boost converter to generate the regulated output voltage.Type: GrantFiled: May 27, 2003Date of Patent: November 2, 2004Assignee: The University of Hong KongInventors: Joe Chui Pong Liu, Franki Ngai Kit Poon, Man Hay Pong
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Publication number: 20040080965Abstract: A fast transient response converter is disclosed which makes use of stepping inductor in a switching converter to speed up output voltage response under fast transient condition. The inductive element in a switching converter is replaced by two series or parallel inductive elements, one of which has a smaller value of inductance than the other. During the fast transient period, the inductor with larger inductance value will be shorted to a voltage source. The total inductance will be greatly reduced and thus allows rapid current change during the transient change.Type: ApplicationFiled: October 24, 2002Publication date: April 29, 2004Inventors: Franki Ngai Kit Poon, Man Hay Pong, Joe Chui Pong Liu
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Method and system for providing a DC voltage with low ripple by overlaying a plurality of AC signals
Patent number: 6697266Abstract: An AC-DC converter that includes a plurality of power conversion units that overlay their signals to generate a DC signal with low voltage level, small voltage and current ripples, but high DC current. The DC signal is further filtered by a LC low pass filter to further minimize the ripples before output to the load. In one embodiment, the plurality of power conversion units is preferably powered by a plurality of input pulse generators. In an alternative embodiment, the power conversion units is powered by a input pulse generator circuit that includes a plurality of n-channel MOSFETs arranged in a full bridge configuration whose gate voltages are controlled by a plurality of pulse generators.Type: GrantFiled: March 4, 2002Date of Patent: February 24, 2004Assignee: University of Hong KongInventors: Franki Ngai Kit Poon, Man Hay Pong, Joe Chui Pong Liu -
Publication number: 20030210024Abstract: A power converter includes a boost converter, a DC/DC converter and a coupler chain. The boost converter receives a rectified AC input and generates a high voltage output. The boost converter includes a zero-voltage-switching transistor that is operable to adjust the power factor of the rectified AC input to generate the high voltage output. The DC/DC converter is coupled to the high voltage output of the boost converter and is configured to generate a regulated output voltage. The DC/DC converter includes a complementary pair of zero-voltage-switching transistors that are operable to regulate the high voltage output of the boost converter to generate the regulated output voltage.Type: ApplicationFiled: May 27, 2003Publication date: November 13, 2003Inventors: Joe Chui Pong Liu, Franki Ngai Kit Poon, Man Hay Pong
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Publication number: 20030165069Abstract: An AC-DC converter that includes a plurality of power conversion units that overlay their signals to generate a DC signal with low voltage level, small voltage and current ripples, but high DC current. The DC signal is further filtered by a LC low pass filter to further minimize the ripples before output to the load. In one embodiment, the plurality of power conversion units is preferably powered by a plurality of input pulse generators. In an alternative embodiment, the power conversion units is powered by a input pulse generator circuit that includes a plurality of n-channel MOSFETs arranged in a full bridge configuration whose gate voltages are controlled by a plurality of pulse generators.Type: ApplicationFiled: March 4, 2002Publication date: September 4, 2003Inventors: Franki Ngai Kit Poon, Man Hay Pong, Joe Chui Pong Liu
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Patent number: 6597587Abstract: A synchronous rectifier using current driven approach is disclosed which can replace diode rectifier in most of the power converter topologies to enable low rectification loss. The present invention comprises a low loss switch and essentially a transformer with at lease one current sensing winding, windings for current sense energy recovery and one driving winding connected to a hysterisis driver which provides driving signal and power for the synchronous rectifier. A hystersis driver is introduced which can reduce the noise interference to the driving signal, increase the operating frequency range, eliminate the saturation problem of the current sensing transformer and hence provide more flexibility to the transformer design. This synchronous rectifier is self-driven and the driving signal is independent of the input voltage of the converter which enhances its application to wide input range converter. Current sense energy recovery enables power converters to operate at high efficiency and high frequency.Type: GrantFiled: April 2, 2002Date of Patent: July 22, 2003Assignee: The University of Hong KongInventors: Frankie Ngai Kit Poon, Joe Chui Pong Liu, Man Hay Pong
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Publication number: 20030112229Abstract: An efficient power driver for color light emitting diodes (LED) is disclosed for driving multiple LEDs for producing different desired colors. Such LED combinations comprising LEDs with different primary colors are suitable for implementing pixels in displaying a digitized image. This disclosed invention provides switching power conversion embodiments such that a single apparatus drives different color LEDs. Furthermore, the disclosed invention provides configurations with and without input to output isolation while enabling control of the current through each LED, for instance by an inductor or operating condition.Type: ApplicationFiled: December 14, 2001Publication date: June 19, 2003Inventors: Man Hay Pong, Franki Ngai Kit Poon, Joe Chui Pong Liu
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Patent number: 6580259Abstract: An AC/DC power converter includes a pair of input terminals, a boost unit, a DC/DC converter, a coupler chain, and a discharge chain. The pair of input terminals connect to a pulsating DC source. The boost unit is coupled to the input terminals and generates a voltage higher than the voltage at the input terminals. The DC/DC converter couples to the boost unit and includes a set of series switches coupled to the primary side of a transformer through a series inductor and capacitor. The DC/DC converter further includes a secondary winding coupled to the transformer and coupled to a rectifier and filter configuration. The coupler chain couples the boost unit to the DC/DC converter. The discharge chain couples the coupler chain to the high voltage source generated by the boost unit. Control pulses synchronize the series switches so that a resonant current flows in the coupler chain and the discharge chain such that the switches can be turned on and off while voltages across the switches are substantially zero.Type: GrantFiled: January 7, 2002Date of Patent: June 17, 2003Assignee: The University of Hong KongInventors: Joe Chui Pong Liu, Franki Ngai Kit Poon, Man Hay Pong
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Publication number: 20020110012Abstract: An AC/DC power converter includes a pair of input terminals, a boost unit, a DC/DC converter, a coupler chain, and a discharge chain. The pair of input terminals connect to a pulsating DC source. The boost unit is coupled to the input terminals and generates a voltage higher than the voltage at the input terminals. The DC/DC converter couples to the boost unit and includes a set of series switches coupled to the primary side of a transformer through a series inductor and capacitor. The DC/DC converter further includes a secondary winding coupled to the transformer and coupled to a rectifier and filter configuration. The coupler chain couples the boost unit to the DC/DC converter. The discharge chain couples the coupler chain to the high voltage source generated by the boost unit. Control pulses synchronize the series switches so that a resonant current flows in the coupler chain and the discharge chain such that the switches can be turned on and off while voltages across the switches are substantially zero.Type: ApplicationFiled: January 7, 2002Publication date: August 15, 2002Inventors: Joe Chui Pong Liu, Franki Ngai Kit Poon, Man Hay Pong