Patents by Inventor Mingda Wang
Mingda Wang 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: 11239746Abstract: A two-stage converter, a method for starting the two-stage converter, an LLC converter, and an application system are provided. A controller of the LLC converter of the two-stage converter first controls a main circuit of the LLC converter to perform hiccup charging on a direct current bus of a later-stage converter at a preset interval, so that the direct current bus voltage of the later-stage converter gradually increases, until an auxiliary power supply of the later-stage converter starts to operate, to supply power to the controller of the later-stage converter. After the controller of the later-stage converter reports the detected direct current bus voltage, the controller of the LLC converter determines whether the output voltage of the LLC converter increases to a hiccup starting voltage. If so, the controller of the LLC converter controls the main circuit to operate in a hiccup voltage stabilization phase.Type: GrantFiled: February 6, 2020Date of Patent: February 1, 2022Assignee: Sungrow Power Supply Co. Ltd.Inventors: Tao Zhao, Fushuai Zhuang, Xinyu Wang, Jiacai Zhuang, Mingda Wang, Yuan Zhuang
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Publication number: 20200403496Abstract: A two-stage converter, a method for starting the two-stage converter, an LLC converter, and an application system are provided. A controller of the LLC converter of the two-stage converter first controls a main circuit of the LLC converter to perform hiccup charging on a direct current bus of a later-stage converter at a preset interval, so that the direct current bus voltage of the later-stage converter gradually increases, until an auxiliary power supply of the later-stage converter starts to operate, to supply power to the controller of the later-stage converter. After the controller of the later-stage converter reports the detected direct current bus voltage, the controller of the LLC converter determines whether the output voltage of the LLC converter increases to a hiccup starting voltage. If so, the controller of the LLC converter controls the main circuit to operate in a hiccup voltage stabilization phase.Type: ApplicationFiled: February 6, 2020Publication date: December 24, 2020Applicant: SUNGROW POWER SUPPLY CO., LTD.Inventors: Tao ZHAO, Fushuai ZHUANG, Xinyu WANG, Jiacai ZHUANG, Mingda WANG, Yuan ZHUANG
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Patent number: 10546738Abstract: An ion transfer device includes a tube, a resistive layer on an inside surface of the tube, and a dielectric layer on the resistive layer. The device defines a conduit providing a transfer path for gas and ions. The conduit is surrounded by the dielectric layer. The dielectric layer protects the resistive layer from the chemical environment in the conduit, while being thin enough to allow charges to pass through the dielectric layer and be dissipated by the resistive layer.Type: GrantFiled: December 19, 2018Date of Patent: January 28, 2020Assignee: Agilent Technologies, Inc.Inventors: Mingda Wang, Maozi Liu, Patrick D. Perkins, Jing Tang
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Patent number: 10176977Abstract: An ion source is configured for soft electron ionization and produces a low electron-energy, yet high-intensity, electron beam. The ion source includes an electron source that produces the electron beam and transmits it into an ionization chamber. The electron beam interacts with sample material in the ionization chamber to produce an ion beam that may be transmitted to a downstream device. The electron source is configured for generating a virtual cathode upstream of the ionization chamber, which enhances the intensity of the electron beam.Type: GrantFiled: November 24, 2015Date of Patent: January 8, 2019Assignee: Agilent Technologies, Inc.Inventor: Mingda Wang
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Publication number: 20180277348Abstract: Mass spectrometry is performed utilizing an electron ionization (EI) source. The EI source ionizes a sample at different electron energies, including below and above 70 eV. The EI source may be utilized for soft ionization as well as hard ionization. The value of the electron energy may be selected so as to favor the formation of molecular ions or other ions of high analytical value. The ion source may be an axial ion source.Type: ApplicationFiled: June 1, 2018Publication date: September 27, 2018Inventors: Harry F. Prest, Mingda Wang, Jeffrey T. Kernan
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Publication number: 20170089915Abstract: Methods of analyte derivatization and soft ionization are provided. The methods include contacting a sample including an analyte with a derivatization agent to produce a modified analyte including a pseudo-molecular analyte group and a leaving group connected via a fragmentable bond; and selectively breaking the fragmentable bond under soft ionization conditions to produce a predominant first fragmentation product including the pseudo-molecular analyte group and a second fragmentation product including the leaving group. The method may further include analyzing the first and second fragmentation products in a mass spectrometer to identify an ion corresponding to the pseudo-molecular analyte group. Also provided are methods for detecting analytes using gas chromatography-mass spectroscopy (GC-MS). These methods find use in a variety of applications in which mass spectroscopic analysis of samples is desired.Type: ApplicationFiled: July 14, 2016Publication date: March 30, 2017Inventors: Mingda Wang, Harry F. Prest
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Publication number: 20160172146Abstract: An ion source is configured for soft electron ionization and produces a low electron-energy, yet high-intensity, electron beam. The ion source includes an electron source that produces the electron beam and transmits it into an ionization chamber. The electron beam interacts with sample material in the ionization chamber to produce an ion beam that may be transmitted to a downstream device. The electron source is configured for generating a virtual cathode upstream of the ionization chamber, which enhances the intensity of the electron beam.Type: ApplicationFiled: November 24, 2015Publication date: June 16, 2016Inventor: Mingda Wang
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Publication number: 20140374583Abstract: Mass spectrometry is performed utilizing an electron ionization (EI) source. The EI source ionizes a sample at different electron energies, including below and above 70 eV. The EI source may be utilized for soft ionization as well as hard ionization. The value of the electron energy may be selected so as to favor the formation of molecular ions or other ions of high analytical value. The ion source may be an axial ion source.Type: ApplicationFiled: June 24, 2013Publication date: December 25, 2014Inventors: Harry F. Prest, Mingda Wang, Jeffrey T. Kernan
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Patent number: 8124930Abstract: An ion transport apparatus includes an ion entrance end, an ion exit end, and electrodes arranged along a longitudinal axis from the ion entrance end toward the ion exit end. The electrodes are configured for applying an RF electrical field that varies along the longitudinal axis such that at the ion entrance end, the RF electrical field comprises a major first multipole component of 2n1 poles where n1?3/2, and at the ion exit end the RF electrical field comprises predominantly a second multipole component of 2n2 poles where n2?3/2 and n2<n1.Type: GrantFiled: June 5, 2009Date of Patent: February 28, 2012Assignee: Agilent Technologies, Inc.Inventor: Mingda Wang
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Publication number: 20100308218Abstract: An ion transport apparatus includes an ion entrance end, an ion exit end, and electrodes arranged along a longitudinal axis from the ion entrance end toward the ion exit end. The electrodes are configured for applying an RF electrical field that varies along the longitudinal axis such that at the ion entrance end, the RF electrical field comprises a major first multipole component of 2n1 poles where n1>3/2, and at the ion exit end the RF electrical field comprises predominantly a second multipole component of 2n2 poles where n2>3/2 and n2<n1.Type: ApplicationFiled: June 5, 2009Publication date: December 9, 2010Inventor: Mingda Wang
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Patent number: 7842918Abstract: In a method for exciting a precursor ion in an ion trap, the ion is trapped in a nonlinear trapping field that includes a quadrupolar field and a multipole field. The quadrupolar field is generated by applying a radio-frequency (RF) trapping voltage to the ion trap at a trapping amplitude and trapping frequency. A supplemental alternating-current (AC) voltage is applied to the ion trap at a supplemental amplitude and supplemental frequency. The supplemental amplitude is low enough to prevent ejection of the ion from the ion trap, and the supplemental frequency differs from the secular frequency of the ion by an offset amount. One or more operating parameters of the ion trap are adjusted, such that the ion absorbs energy from the supplemental field sufficient to undergo collision-induced dissociation (CID) without being in resonance with the supplemental field.Type: GrantFiled: March 7, 2007Date of Patent: November 30, 2010Assignee: Varian, IncInventor: Mingda Wang
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Patent number: 7564029Abstract: Sample material ionized in a sample receiving chamber is flowed into a sample conduit. Drying gas may also flow into the sample conduit and may be heated. The pressure and length of the sample conduit may be provided according to the product 50 or greater Torr?cm. The sample conduit may include a turn. The sample conduit may lead to an ion extraction chamber at which a sampling orifice may lead to a mass spectrometer. The diameter of the sample conduit may be larger than the diameter of the sampling orifice. An electrical field may be applied in the ion extraction chamber to slow incoming ions. A voltage jump may be applied to the sample conduit.Type: GrantFiled: August 15, 2007Date of Patent: July 21, 2009Assignee: Varian, Inc.Inventors: Mingda Wang, Charles A. Fancher, Felician Muntean, Urs Steiner
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Patent number: 7501623Abstract: An electrode for use in a device such as an ion trap has an axial length extending generally in the direction of a central axis from a first axial end to a second axial end, and an inside surface. The inside surface includes a surface profile that is uniform from the first axial end to the second axial end, or at least is uniform for a uniform section length along the axial direction. The electrode may include an elongated surface feature such as a groove that extends for at least the uniform section length. An aperture may communicate with the groove. The electrode may be axially segmented into regions. Gaps between the regions may be oriented at an angle relative to a plane orthogonal to the central axis. The electrode may be one of several electrodes arranged as an electrode structure coaxially disposed about an elongated interior space.Type: GrantFiled: January 30, 2006Date of Patent: March 10, 2009Assignee: Varian, Inc.Inventors: Roger Tong, Mingda Wang, Gregory J. Wells
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Publication number: 20090045330Abstract: Sample material ionized in a sample receiving chamber is flowed into a sample conduit. Drying gas may also flow into the sample conduit and may be heated. The pressure and length of the sample conduit may be provided according to the product 50 or greater Torr-cm. The sample conduit may include a turn. The sample conduit may lead to an ion extraction chamber at which a sampling orifice may lead to a mass spectrometer. The diameter of the sample conduit may be larger than the diameter of the sampling orifice. An electrical field may be applied in the ion extraction chamber to slow incoming ions. A voltage jump may be applied to the sample conduit.Type: ApplicationFiled: August 15, 2007Publication date: February 19, 2009Inventors: Mingda Wang, Charles A. Fancher, Felician Muntean, Urs Steiner
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Publication number: 20080217527Abstract: In a method for exciting a precursor ion in an ion trap, the ion is trapped in a nonlinear trapping field that includes a quadrupolar field and a multipole field. The quadrupolar field is generated by applying a radio-frequency (RF) trapping voltage to the ion trap at a trapping amplitude and trapping frequency. A supplemental alternating-current (AC) voltage is applied to the ion trap at a supplemental amplitude and supplemental frequency. The supplemental amplitude is low enough to prevent ejection of the ion from the ion trap, and the supplemental frequency differs from the secular frequency of the ion by an offset amount. One or more operating parameters of the ion trap are adjusted, such that the ion absorbs energy from the supplemental field sufficient to undergo collision-induced dissociation (CID) without being in resonance with the supplemental field.Type: ApplicationFiled: March 7, 2007Publication date: September 11, 2008Inventor: Mingda Wang
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Patent number: 7378648Abstract: A desired ion is isolated in an ion trapping volume by applying an ion isolation signal to a plurality of ions in the ion trapping volume, including the desired ion to be retained in the ion trapping volume and an undesired ion to be ejected from the ion trapping volume. The ion isolation signal includes a plurality of signal components spanning a frequency range. The plurality of signal components includes a first component having a frequency near a secular frequency of the desired ion, and an adjacent component having a frequency adjacent to the frequency of the first component. The first component has an amplitude greater than the amplitude of the adjacent component.Type: GrantFiled: September 30, 2005Date of Patent: May 27, 2008Assignee: Varian, Inc.Inventors: Mingda Wang, Doris Lee, Kenneth Newton, Steve Schachterle
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Patent number: 7329879Abstract: A device for manipulating ions which includes a perforated folder of electrically conductive material, a first electrode fixed to the holder and a second electrode extending parallel to the first electrode and spaced from the first electrode and holder. The second electrode is connected to the holder through a rigid support of electrically insulated material.Type: GrantFiled: February 22, 2005Date of Patent: February 12, 2008Assignee: Agilent Technologies, Inc.Inventors: Jeffrey T. Kernan, Edward C. Cirimele, Mingda Wang, J. Gerson Goldberg, James L. Bertsch
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Patent number: 7259379Abstract: An electron impact ion source includes an ionization chamber in which a first rf multipole field can be generated and an ion guide positioned downstream from the ionization chamber in which a second rf multipole field can be generated wherein electrons are injected into the ionization chamber along the axis (on-axis) to ionize an analyte sample provided to the ionization chamber.Type: GrantFiled: November 9, 2005Date of Patent: August 21, 2007Assignee: Agilent Technologies, Inc.Inventors: Mingda Wang, Edward C. Cirimele
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Publication number: 20070176095Abstract: An electrode for use in a device such as an ion trap has an axial length extending generally in the direction of a central axis from a first axial end to a second axial end, and an inside surface. The inside surface includes a surface profile that is uniform from the first axial end to the second axial end, or at least is uniform for a uniform section length along the axial direction. The electrode may include an elongated surface feature such as a groove that extends for at least the uniform section length. An aperture may communicate with the groove. The electrode may be axially segmented into regions. Gaps between the regions may be oriented at an angle relative to a plane orthogonal to the central axis. The electrode may be one of several electrodes arranged as an electrode structure coaxially disposed about an elongated interior space.Type: ApplicationFiled: January 30, 2006Publication date: August 2, 2007Inventors: Roger Tong, Mingda Wang, Gregory Wells
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Publication number: 20070084994Abstract: A desired ion is isolated in an ion trapping volume by applying an ion isolation signal to a plurality of ions in the ion trapping volume, including the desired ion to be retained in the ion trapping volume and an undesired ion to be ejected from the ion trapping volume. The ion isolation signal includes a plurality of signal components spanning a frequency range. The plurality of signal components includes a first component having a frequency near a secular frequency of the desired ion, and an adjacent component having a frequency adjacent to the frequency of the first component. The first component has an amplitude greater than the amplitude of the adjacent component.Type: ApplicationFiled: September 30, 2005Publication date: April 19, 2007Inventors: Mingda Wang, Doris Lee, Kenneth Newton, Steve Schachterle