Patents by Inventor Peter Waldemar Lehn
Peter Waldemar Lehn 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: 11970067Abstract: A switching circuit for controlling charging input from a DC source to at least one inverter circuit, each inverter circuit corresponding to at least one respective battery, the switching circuit is provided with a switching device which when positioned in series with the inverter circuit and the DC source, the switching device configured to control the charging input provided to the at least one respective battery, the switching device controllable in conjunction with switches in the at least one inverter circuit based on at least one voltage of the at least one respective battery.Type: GrantFiled: June 15, 2018Date of Patent: April 30, 2024Assignees: THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTO, ELEAPPOWER LTD.Inventors: Peter Waldemar Lehn, Ruoyun Shi, Theodore Soong
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Patent number: 11962235Abstract: Embodiments are directed to a modular multi-level DC/DC power electronic converter for transferring power from or between a higher-voltage DC network and a lower-voltage DC network. The power electronic converter features a series connection of low-voltage voltage source modules (VSM) and a current source module (CSM). The series connection of the sub-module elements forms a string. The higher-voltage DC network is interfaced to the converter by connecting across the outer terminals of the string. The lower-voltage DC network is interfaced to the converter through the CSM.Type: GrantFiled: December 24, 2020Date of Patent: April 16, 2024Inventors: Philippe Gray, Peter Waldemar Lehn
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Publication number: 20240039345Abstract: There is described a wireless power transfer system utilizing a new excitation-quadrature-quadrature transmitter pad which includes one excitation coil and at least two decoupled quadrature auxiliary coils. A described resonant tank design method is proposed for constant-current charging and zero phase angle conditions. When there is a lateral misalignment in the receiver pad, the auxiliary coil that is better coupled with the receiver pad conducts more current than the more distant auxiliary coil does, reducing the leakage magnetic field in the surrounding area and/or improving transmission efficiency.Type: ApplicationFiled: February 9, 2022Publication date: February 1, 2024Inventors: Zhichao LUO, Shuang NIE, Mehanathan PATHMANATHAN, Peter Waldemar LEHN
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Publication number: 20240010076Abstract: A dual inverter drivetrain having an energy storing fuel cell integrated into an electric vehicle is disclosed. A method of operating the dual inverter drivetrain using a power sharing control approach is described, which allows the key requirements of a fuel cell to be achieved without compromising the dynamic performance of the electric vehicle drive system. In particular, the ability of this control approach to ensure unidirectional power transfer from the fuel cell even in the event of regenerative braking, and a slowly changing fuel cell power despite fast motor torque transients were exhibited.Type: ApplicationFiled: December 16, 2021Publication date: January 11, 2024Inventors: Peter Waldemar LEHN, Mehanathan PATHMANATHAN, Sepehr SEMSAR, Caniggia Castro Diniz VIANA
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Publication number: 20230246560Abstract: An approach for controlling operation of an electrically symmetrical electric power circuit is described herein to reduce common mode leakage currents. The approach can include, for example, a controller circuit configured to control a plurality of switches of the electrically symmetrical electric power circuit, such that one or more electrically symmetrical pairs of switches of the plurality of switches are operated at a same operational state when the power circuit is coupled to an electrical grid to reduce the common mode leakage current. A variant is also described that is adapted for current ripple and overall THD distortion reduction, which can be useful for vehicle to grid power transfer situations.Type: ApplicationFiled: June 24, 2021Publication date: August 3, 2023Inventors: Peter Waldemar LEHN, Caniggia CASTRO DINIZ VIANA, Sepehr SEMSAR, Mehanathan PATHMANATHAN
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Patent number: 11289906Abstract: A module for interconnecting a pair of DC sources or a pair of DC loads into a DC bus includes: a first port for each source or load; a switching cell for each first port, each cell having a pair of terminals and a switching node; a second port operatively connected to the DC bus and having a pair of terminals, one of the pair of terminals of the second port being connected to one of the terminals of one of the cells and the other of the pair of terminals of the second port being connected to one of the terminals of the other of the cells; and a filter inductor connected between the switching nodes of the cells. Systems including the module and methods utilizing the system are also disclosed.Type: GrantFiled: August 15, 2020Date of Patent: March 29, 2022Assignee: THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTOInventors: Peter Waldemar Lehn, Mike Kavian Ranjram, Sebastian Rivera Iunnissi, Yuanzheng Han
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Publication number: 20210146792Abstract: A switching circuit for controlling charging input from a DC source to at least one inverter circuit, each inverter circuit corresponding to at least one respective battery, the switching circuit is provided with a switching device which when positioned in series with the inverter circuit and the DC source, the switching device configured to control the charging input provided to the at least one respective battery, the switching device controllable in conjunction with switches in the at least one inverter circuit based on at least one voltage of the at least one respective battery.Type: ApplicationFiled: June 15, 2018Publication date: May 20, 2021Inventors: Peter Waldemar LEHN, Ruoyun SHI, Theodore SOONG
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Publication number: 20210111629Abstract: Embodiments are directed to a modular multi-level DC/DC power electronic converter for transferring power from or between a higher-voltage DC network and a lower-voltage DC network. The power electronic converter features a series connection of low-voltage voltage source modules (VSM) and a current source module (CSM). The series connection of the sub-module elements forms a string. The higher-voltage DC network is interfaced to the converter by connecting across the outer terminals of the string. The lower-voltage DC network is interfaced to the converter through the CSM.Type: ApplicationFiled: December 24, 2020Publication date: April 15, 2021Inventors: Philippe GRAY, Peter Waldemar LEHN
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Publication number: 20210036515Abstract: A module for interconnecting a pair of DC sources or a pair of DC loads into a DC bus includes: a first port for each source or load; a switching cell for each first port, each cell having a pair of terminals and a switching node; a second port operatively connected to the DC bus and having a pair of terminals, one of the pair of terminals of the second port being connected to one of the terminals of one of the cells and the other of the pair of terminals of the second port being connected to one of the terminals of the other of the cells; and a filter inductor connected between the switching nodes of the cells. Systems including the module and methods utilizing the system are also disclosed.Type: ApplicationFiled: August 15, 2020Publication date: February 4, 2021Inventors: Peter Waldemar LEHN, Mike Kavian RANJRAM, Sebastian Rivera IUNNISSI, Yuanzheng HAN
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Patent number: 10770893Abstract: A module for interconnecting a pair of DC sources or a pair of DC loads into a DC bus includes: a first port for each source or load; a switching cell for each first port, each cell having a pair of terminals and a switching node; a second port operatively connected to the DC bus and having a pair of terminals, one of the pair of terminals of the second port being connected to one of the terminals of one of the cells and the other of the pair of terminals of the second port being connected to one of the terminals of the other of the cells; and a filter inductor connected between the switching nodes of the cells. Systems including the module and methods utilizing the system are also disclosed.Type: GrantFiled: October 20, 2017Date of Patent: September 8, 2020Assignee: THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTOInventors: Peter Waldemar Lehn, Mike Kavian Ranjram, Sebastian Rivera Iunnissi, Yuanzheng Han
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Patent number: 10707679Abstract: An improved method for sharing power between multiple battery energy storage systems (BESS) connected to a common DC network having a nominal voltage wherein the current from each BESS is regulated based upon a voltage-current characteristic which defines an output current which increases linearly in a predetermined ratio as the measured system voltage decreases. The predetermined ratio is constant in respect of each BESS. The output current of each BESS varies based upon an external signal that varies with the state of charge of the BESS.Type: GrantFiled: June 15, 2018Date of Patent: July 7, 2020Inventors: Peter Waldemar Lehn, Kyle Muehlegg
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Patent number: 10291123Abstract: A module for interconnecting a pair of DC sources or a pair of DC loads into a DC bus includes: a first port for each source or load; a switching cell for each first port, each cell having a pair of terminals and a switching node; a second port operatively connected to the DC bus and having a pair of terminals, one of the pair of terminals of the second port being connected to one of the terminals of one of the cells and the other of the pair of terminals of the second port being connected to one of the terminals of the other of the cells; and a filter inductor connected between the switching nodes of the cells. Systems including the module and methods utilizing the system are also disclosed.Type: GrantFiled: April 30, 2015Date of Patent: May 14, 2019Assignee: THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTOInventors: Peter Waldemar Lehn, Mike Kavian Ranjram, Yuanzheng Han
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Publication number: 20180366948Abstract: An improved method for sharing power between multiple battery energy storage systems (BESS) connected to a common DC network having a nominal voltage wherein the current from each BESS is regulated based upon a voltage-current characteristic which defines an output current which increases linearly in a predetermined ratio as the measured system voltage decreases. The predetermined ratio is constant in respect of each BESS. The output current of each BESS varies based upon an external signal that varies with the state of charge of the BESS.Type: ApplicationFiled: June 15, 2018Publication date: December 20, 2018Inventors: Peter Waldemar Lehn, Kyle Muehlegg
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Publication number: 20180123341Abstract: A module for interconnecting a pair of DC sources or a pair of DC loads into a DC bus includes: a first port for each source or load; a switching cell for each first port, each cell having a pair of terminals and a switching node; a second port operatively connected to the DC bus and having a pair of terminals, one of the pair of terminals of the second port being connected to one of the terminals of one of the cells and the other of the pair of terminals of the second port being connected to one of the terminals of the other of the cells; and a filter inductor connected between the switching nodes of the cells. Systems including the module and methods utilizing the system are also disclosed.Type: ApplicationFiled: October 20, 2017Publication date: May 3, 2018Inventors: Peter Waldemar LEHN, Mike Kavian RANJRAM, Sebastian Rivera IUNNISSI, Yuanzheng HAN
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Publication number: 20170063233Abstract: A module for interconnecting a pair of DC sources or a pair of DC loads into a DC bus includes: a first port for each source or load; a switching cell for each first port, each cell having a pair of terminals and a switching node; a second port operatively connected to the DC bus and having a pair of terminals, one of the pair of terminals of the second port being connected to one of the terminals of one of the cells and the other of the pair of terminals of the second port being connected to one of the terminals of the other of the cells; and a filter inductor connected between the switching nodes of the cells. Systems including the module and methods utilizing the system are also disclosed.Type: ApplicationFiled: April 30, 2015Publication date: March 2, 2017Inventors: Peter Waldemar Lehn, Mike Kavian Ranjram, Yuanzheng Han
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Patent number: 9318968Abstract: The present invention provides a series of DC-DC converter circuit designs, and DC-DC converters based on such circuit design, that provide high input-to-output voltage conversion. The converters include a resonant tank and a means for interrupting the tank current to produce a near zero-loss “hold” state wherein zero current and/or zero voltage switching is provided, while providing control over the amount of power transfer. A resonant DC-DC converter for high voltage step-up ratio in accordance with the circuit design includes: (a) a low voltage DC-AC converter, (b) a resonant tank, (c) a high voltage AC-DC converter, (d) a (i) common ground on an input and an output without use of a transformer and/or (ii) a single high voltage controllable switch within the resonant tank.Type: GrantFiled: February 18, 2011Date of Patent: April 19, 2016Assignee: UNIVERSITY OF TORONTO GOVERNING COUNCILInventor: Peter Waldemar Lehn
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Patent number: 9059636Abstract: The present invention provides a series of DC-DC converter circuit designs, and DC-DC converters based on such circuit design, that provide high input-to-output voltage conversion. The converters include a resonant tank and a means for interrupting the tank current to produce a near zero-loss “hold” state wherein zero current and/or zero voltage switching is provided, while providing control over the amount of power transfer. A resonant DC-DC converter for high voltage step-up ratio in accordance with the circuit design includes: (a) a low voltage DC-AC converter, (b) a resonant tank, (c) a high voltage AC-DC converter, (d) a (i) common ground on an input and an output without use of a transformer and/or (ii) a single high voltage controllable switch within the resonant tank.Type: GrantFiled: May 10, 2012Date of Patent: June 16, 2015Inventors: Peter Waldemar Lehn, Luis Zubieta, Damien Frost
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Publication number: 20150162840Abstract: A method of operating a resonant DC-DC converter is provided where the resonant DC-DC converter includes a high voltage boost LLC circuit. The method includes providing variable power flow control to the LLC circuit with externally determined input and output voltages using frequency control. Frequency control is applied such that it emulates different loading conditions. For fixed input and output voltages this corresponds to operating along horizontal curves on the voltage gain compared to the switching frequency operating plane.Type: ApplicationFiled: November 6, 2012Publication date: June 11, 2015Inventors: Damien Francis Frost, Luis Eduardo Zubieta, Peter Waldemar Lehn
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Publication number: 20130121033Abstract: The present invention provides a series of DC-DC converter circuit designs, and DC-DC converters based on such circuit design, that provide high input-to-output voltage conversion. The converters include a resonant tank and a means for interrupting the tank current to produce a near zero-loss “hold” state wherein zero current and/or zero voltage switching is provided, while providing control over the amount of power transfer. A resonant DC-DC converter for high voltage step-up ratio in accordance with the circuit design includes: (a) a low voltage DC-AC converter, (b) a resonant tank, (c) a high voltage AC-DC converter, (d) a (i) common ground on an input and an output without use of a transformer and/or (ii) a single high voltage controllable switch within the resonant tank.Type: ApplicationFiled: May 10, 2012Publication date: May 16, 2013Inventors: Peter Waldemar Lehn, Luis Zubieta, Damien Frost
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Publication number: 20120195074Abstract: The present invention provides a series of DC-DC converter circuit designs, and DC-DC converters based on such circuit design, that provide high input-to-output voltage conversion. The converters include a resonant tank and a means for interrupting the tank current to produce a near zero-loss “hold” state wherein zero current and/or zero voltage switching is provided, while providing control over the amount of power transfer. A resonant DC-DC converter for high voltage step-up ratio in accordance with the circuit design includes: (a) a low voltage DC-AC converter, (b) a resonant tank, (c) a high voltage AC-DC converter, (d) a (i) common ground on an input and an output without use of a transformer and/or (ii) a single high voltage controllable switch within the resonant tank.Type: ApplicationFiled: February 18, 2011Publication date: August 2, 2012Applicant: University of Toronto Governing CouncilInventor: Peter Waldemar Lehn