Patents by Inventor Zhanqi Du
Zhanqi Du 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: 10396679Abstract: A rectifying circuit is provided, which includes a first channel circuit, a comparator circuit, and a second channel circuit. The first channel circuit rectifies a first input signal using a transistor that is coupled between an input of the first channel circuit and a node. The comparator circuit is coupled with the transistor and controls it based on a difference between a representative voltage of the first input signal and a representative voltage of the node. The second channel circuit rectifies a second input signal using a diode coupled between an input of the second channel circuit and the node. The transistor may be a first MOSFET and the comparator circuit may be coupled with the first MOSFET by way of a second MOSFET. The second MOSFET controls the first MOSFET and is itself controlled by the comparator circuit.Type: GrantFiled: June 7, 2018Date of Patent: August 27, 2019Assignee: OSRAM SYLVANIA Inc.Inventor: George Zhanqi Du
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Publication number: 20180358905Abstract: A rectifying circuit is provided, which includes a first channel circuit, a comparator circuit, and a second channel circuit. The first channel circuit rectifies a first input signal using a transistor that is coupled between an input of the first channel circuit and a node. The comparator circuit is coupled with the transistor and controls it based on a difference between a representative voltage of the first input signal and a representative voltage of the node. The second channel circuit rectifies a second input signal using a diode coupled between an input of the second channel circuit and the node. The transistor may be a first MOSFET and the comparator circuit may be coupled with the first MOSFET by way of a second MOSFET. The second MOSFET controls the first MOSFET and is itself controlled by the comparator circuit.Type: ApplicationFiled: June 7, 2018Publication date: December 13, 2018Applicant: OSRAM SYLVANIA Inc.Inventor: George Zhanqi Du
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Patent number: 9167641Abstract: The present invention relates to providing an improved dimming driver circuitry, system and a method thereof. The dimming driver circuitry is configured to enable dimming intensity of light generated by one or more light sources, the dimming driver circuitry being connected to a dimmer that provides to it an alternating current (AC) signal. The dimming driver circuitry may in some examples not include a processing unit. Additionally or alternatively, the dimming driver circuitry may in some examples apply amplitude modulation to the output current provided to the one or more light sources. In some of these examples, the dimming driver circuitry may begin to apply at substantially the same time pulse width modulation and amplitude modulation to the output current provided to the one or more light sources.Type: GrantFiled: March 3, 2011Date of Patent: October 20, 2015Assignee: LIGHTECH ELECTRONIC INDUSTRIES LTD.Inventors: Peter W. Shackle, Zhanqi Du
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Publication number: 20140252991Abstract: Methods and apparatus are described that can provide improved power factor correction and total harmonic distortion, efficiency and/or direct feedback of load current variations to a power source inverter. In one example, a power supply, for example, a ballast, can have an input circuit, an output circuit and an inverter circuit coupled between the input circuit and the output circuit. A current feedback circuit is coupled between the output circuit and the inverter circuit and configured to feed current back to the inverter circuit through a transformer stage separate from the inverter as a function of a current level in the output circuit.Type: ApplicationFiled: May 23, 2014Publication date: September 11, 2014Applicant: FULHAM COMPANY LIMITEDInventors: Peter W. Shackle, Zhanqi Du
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Patent number: 8736189Abstract: Methods and apparatus are described that can provide improved power factor correction and total harmonic distortion, efficiency and/or direct feedback of load current variations to a power source inverter. In one example, a power supply, for example, a ballast, can have an input circuit, an output circuit and an inverter circuit coupled between the input circuit and the output circuit. A current feedback circuit is coupled between the output circuit and the inverter circuit and configured to feed current back to the inverter circuit through a transformer stage separate from the inverter as a function of a current level in the output circuit.Type: GrantFiled: December 23, 2006Date of Patent: May 27, 2014Assignee: Fulham Company LimitedInventors: Peter W. Shackle, Zhanqi Du
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Patent number: 8203276Abstract: The present invention relates to providing an improved phase controlled dimming LED driver circuitry, system and a method thereof, which is configured to enable dimming intensity of light generated by a light source, said phase controlled dimming driver circuitry being connected to a phase control dimmer that provides to it a regulated alternating current (AC) signal, wherein said phase controlled dimming driver circuitry does not include a microprocessor and pulse width modulates its output current, provided to said light source, at a frequency unrelated to the AC signal frequency. Further, the phase controlled dimming driver circuitry applies amplitude modulation (AM) and pulse width modulation (PWM) substantially simultaneously to the output current provided to the light source.Type: GrantFiled: November 28, 2008Date of Patent: June 19, 2012Assignee: Lightech Electronic Industries Ltd.Inventors: Peter W. Shackle, Zhanqi Du
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Publication number: 20110148318Abstract: The present invention relates to providing an improved dimming driver circuitry, system and a method thereof. The dimming driver circuitry is configured to enable dimming intensity of light generated by one or more light sources, the dimming driver circuitry being connected to a dimmer that provides to it an alternating current (AC) signal. The dimming driver circuitry may in some examples not include a processing unit. Additionally or alternatively, the dimming driver circuitry may in some examples apply amplitude modulation to the output current provided to the one or more light sources. In some of these examples, the dimming driver circuitry may begin to apply at substantially the same time pulse width modulation and amplitude modulation to the output current provided to the one or more light sources.Type: ApplicationFiled: March 3, 2011Publication date: June 23, 2011Applicant: LIGHTECH ELECTRONIC INDUSTRIES LTD.Inventors: Peter W. SHACKLE, Zhanqi DU
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Publication number: 20100253245Abstract: The present invention relates to a method, system and current limiting circuit configured to limit the excess output current passing through a load, said current limiting circuit comprising a resistor connected in series with said load and in parallel with a switch, which is initially turned OFF, wherein said switch is turned ON, thereby shorting said resistor, when the output voltage applied to said load is decreased by a predetermined level.Type: ApplicationFiled: April 6, 2009Publication date: October 7, 2010Applicant: LIGHTECH ELECTRONIC INDUSTRIES LTD.Inventors: Zhanqi DU, Peter W. SHACKLE
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Publication number: 20100134038Abstract: The present invention relates to providing an improved phase controlled dimming LED driver circuitry, system and a method thereof, which is configured to enable dimming intensity of light generated by a light source, said phase controlled dimming driver circuitry being connected to a phase control dimmer that provides to it a regulated alternating current (AC) signal, wherein said phase controlled dimming driver circuitry does not include a microprocessor and pulse width modulates its output current, provided to said light source, at a frequency unrelated to the AC signal frequency. Further, the phase controlled dimming driver circuitry applies amplitude modulation (AM) and pulse width modulation (PWM) substantially simultaneously to the output current provided to the light source.Type: ApplicationFiled: November 28, 2008Publication date: June 3, 2010Applicant: LIGHTECH ELECTRONIC INDUSTRIES LTD.Inventors: Peter W. SHACKLE, Zhanqi Du
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Publication number: 20080150447Abstract: Methods and apparatus are described that can provide improved power factor correction and total harmonic distortion, efficiency and/or direct feedback of load current variations to a power source inverter. In one example, a power supply, for example, a ballast, can have an input circuit, an output circuit and an inverter circuit coupled between the input circuit and the output circuit. A current feedback circuit is coupled between the output circuit and the inverter circuit and configured to feed current back to the inverter circuit through a transformer stage separate from the inverter as a function of a current level in the output circuit.Type: ApplicationFiled: December 23, 2006Publication date: June 26, 2008Inventors: Peter W. Shackle, Zhanqi Du