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• Article

  A 0.79 pJ/K-Gate, 83% efficient unified core and voltage regulator architecture for sub/near-threshold operation in 130 nm CMOS

  Zhang, S., Tu, J. S., Shanbhag, N. R. & Krein, P. T., Nov 1 2014, In: IEEE Journal of Solid-State Circuits. 49, 11, p. 2644-2657 14 p., 6901296.

  Research output: Contribution to journal › Article › peer-review

  • Voltage regulators
  • Capacitors
  • Energy efficiency
  • Electron energy levels
  • FIR filters

• A dual-primal finite-element tearing and interconnecting method combined with tree-cotree splitting for modeling electromechanical devices

  Yao, W., Jin, J. & Krein, P. T., Mar 1 2013, In: International Journal of Numerical Modelling: Electronic Networks, Devices and Fields. 26, 2, p. 151-163 13 p.

  Research output: Contribution to journal › Article › peer-review

  • Electromechanical devices
  • Combined Method
  • Primal-dual
  • Finite Element
  • Modeling

• A dynamic photovoltaic model incorporating capacitive and reverse-bias characteristics

  Kim, K. A., Xu, C., Jin, L. & Krein, P. T., Aug 28 2013, In: IEEE Journal of Photovoltaics. 3, 4, p. 1334-1341 8 p., 6584777.

  Research output: Contribution to journal › Article › peer-review

  • Photovoltaic cells
  • photovoltaic cells
  • dynamic characteristics
  • strings
  • cells

• A finite-element-based domain decomposition method for efficient simulation of nonlinear electromechanical problems

  Yao, W., Jin, J., Krein, P. T. & Magill, M. P., Jun 2014, In: IEEE Transactions on Energy Conversion. 29, 2, p. 309-319 11 p., 6774426.

  Research output: Contribution to journal › Article › peer-review

  • Domain decomposition methods
  • Newton-Raphson method
  • Finite element method
  • Nonlinear analysis
  • Magnets

• A highly efficient domain decomposition method applied to 3-D finite-element analysis of electromechanical and electric machine problems

  Yao, W., Jin, J. M. & Krein, P. T., Sep 27 2012, In: IEEE Transactions on Energy Conversion. 27, 4, p. 1078-1086 9 p., 6310043.

  Research output: Contribution to journal › Article › peer-review

  • Domain decomposition methods
  • Electric machinery
  • Finite element method
  • Parallel processing systems
  • Tensors

• An Analytical Time-Domain Expression for the Net Ripple Produced by Parallel Interleaved Converters

  Johnson, B. B. & Krein, P. T., Mar 2017, In: IEEE Transactions on Circuits and Systems II: Express Briefs. 64, 3, p. 289-293 5 p., 7457663.

  Research output: Contribution to journal › Article › peer-review

  • Fourier series

• An Integrated Inductive Power Transfer System Design with a Variable Inductor for Misalignment Tolerance and Battery Charging Applications

  Zhang, Z., Zhu, F., Xu, D., Krein, P. T. & Ma, H., Nov 2020, In: IEEE Transactions on Power Electronics. 35, 11, p. 11544-11556 13 p., 9069415.

  Research output: Contribution to journal › Article › peer-review

  • Charging (batteries)
  • Systems analysis
  • Electric potential
  • Technology transfer
  • Switching frequency

• Application of the LU recombination method to the FETI-DP method for solving low-frequency multiscale electromagnetic problems

  Yao, W., Jin, J. & Krein, P. T., Oct 4 2013, In: IEEE Transactions on Magnetics. 49, 10, p. 5346-5355 10 p., 6517909.

  Research output: Contribution to journal › Article › peer-review

  • Domain decomposition methods
  • Reluctance motors
  • Eddy currents
  • Linear systems
  • Drilling

• A Redundant Unit to Form T-Type Three-Level Inverters Tolerant of IGBT Open-Circuit Faults in Multiple Legs

  Wang, B., Li, Z., Bai, Z., Krein, P. T. & Ma, H., Jan 2020, In: IEEE Transactions on Power Electronics. 35, 1, p. 924-939 16 p., 8693980.

  Research output: Contribution to journal › Article › peer-review

  • Insulated gate bipolar transistors (IGBT)
  • Switches
  • Networks (circuits)
  • Diodes
  • Harmonic distortion

• Bus selection in multibus DC microgrids

  Balog, R. S. & Krein, P. T., May 30 2011, In: IEEE Transactions on Power Electronics. 26, 3, p. 860-867 8 p., 5643159.

  Research output: Contribution to journal › Article › peer-review

  • Diodes
  • Electric potential
  • Redundancy
  • Acoustic impedance
  • Controllers

• Concerning maximum power point tracking for photovoltaic optimization using ripple-based extremum seeking control

  Bazzi, A. M. & Krein, P. T., Aug 3 2011, In: IEEE Transactions on Power Electronics. 26, 6, p. 1611-1612 2 p., 5959287.

  Research output: Contribution to journal › Article › peer-review

  • Power electronics

• Coupled-inductor filter: A basic filter building block

  Balog, R. S. & Krein, P. T., Jan 1 2013, In: IEEE Transactions on Power Electronics. 28, 1, p. 537-546 10 p., 6145773.

  Research output: Contribution to journal › Article › peer-review

  • Networks (circuits)
  • Topology
  • Electric inductors
  • Power converters
  • Switching frequency

• Differential power processing for DC systems

  Shenoy, P. S. & Krein, P. T., Apr 2013, In: IEEE Transactions on Power Electronics. 28, 4, p. 1795-1806 12 p.

  Research output: Contribution to journal › Article › peer-review

  • Electric potential
  • Voltage regulators
  • Digital circuits
  • Conversion efficiency
  • Energy conversion

• Differential power processing for increased energy production and reliability of photovoltaic systems

  Shenoy, P. S., Kim, K. A., Johnson, B. B. & Krein, P. T., Nov 14 2013, In: IEEE Transactions on Power Electronics. 28, 6, p. 2968-2979 12 p.

  Research output: Contribution to journal › Article › peer-review

  • Conversion efficiency
  • Energy conversion
  • Reliability analysis
  • Monitoring

• Evaluation of induction and permanent-magnet synchronous machines using drive-cycle energy and loss minimization in traction applications

  Buyukdegirmenci, V. T., Bazzi, A. M. & Krein, P. T., Jan 1 2014, In: IEEE Transactions on Industry Applications. 50, 1, p. 395-403 9 p., 6524023.

  Research output: Contribution to journal › Article › peer-review

  • Permanent magnets
  • Hybrid vehicles
  • Fluxes
  • Simulators
  • Energy utilization

• Formulation of PID control for DC-DC converters based on capacitor current: A geometric context

  Kapat, S. & Krein, P. T., Feb 20 2012, In: IEEE Transactions on Power Electronics. 27, 3, p. 1424-1432 9 p., 5982421.

  Research output: Contribution to journal › Article › peer-review

  • Three term control systems
  • DC-DC converters
  • Capacitors
  • Electric potential
  • Derivatives

• High-current AlGaN/GaN high electron mobility transistors achieved by selective-area growth via plasma-assisted molecular beam epitaxy

  Pang, L., Krein, P. T., Kim, K. W., Lee, J. H. & Kim, K., Jan 1 2014, In: Physica Status Solidi (A) Applications and Materials Science. 211, 1, p. 180-183 4 p.

  Research output: Contribution to journal › Article › peer-review

  • aluminum gallium nitride
  • Molecular beam epitaxy
  • High electron mobility transistors
  • high electron mobility transistors
  • Plasmas

• IGBT and diode loss estimation under hysteresis switching

  Bazzi, A. M., Krein, P. T., Kimball, J. W. & Kepley, K., 2012, In: IEEE Transactions on Power Electronics. 27, 3, p. 1044-1048 5 p., 5981397.

  Research output: Contribution to journal › Article › peer-review

  • Insulated gate bipolar transistors (IGBT)
  • Hysteresis
  • Diodes
  • Thermoanalysis
  • Modulation

• Improved time optimal control of a buck converter based on capacitor current

  Kapat, S. & Krein, P. T., Feb 20 2012, In: IEEE Transactions on Power Electronics. 27, 3, p. 1444-1454 11 p., 5970122.

  Research output: Contribution to journal › Article › peer-review

  • Capacitors
  • Recovery
  • Sliding mode control
  • Electric potential

• Interface analysis of Ti/Al/Ti/Au ohmic contacts with regrown n ⁺ -GaN layers using molecular beam epitaxy

  Seo, H. C., Sivaramakrishnan, S., Zuo, J-M., Pang, L., Krein, P. T. & Kim, K., Dec 1 2011, In: Surface and Interface Analysis. 43, 13, p. 1627-1631 5 p.

  Research output: Contribution to journal › Article › peer-review

  • Molecular beam epitaxy
  • Ohmic contacts
  • electric contacts
  • Metals
  • molecular beam epitaxy

• Loss Minimization and Maximum Torque-Per-Ampere Operation for Variable-Pole Induction Machines

  Libbos, E., Ku, B., Agrawal, S., Tungare, S., Banerjee, A. & Krein, P. T., Sep 2020, In: IEEE Transactions on Transportation Electrification. 6, 3, p. 1051-1064 14 p., 9099876.

  Research output: Contribution to journal › Article › peer-review

  • Pole
  • induction
  • Poles
  • Torque
  • Stators

• Markov reliability modeling for induction motor drives under field-oriented control

  Bazzi, A. M., Dominguez-Garcia, A. & Krein, P. T., Jan 16 2012, In: IEEE Transactions on Power Electronics. 27, 2, p. 534-546 13 p., 6021377.

  Research output: Contribution to journal › Article › peer-review

  • Vector control (Electric machinery)
  • Induction motors
  • Fault tolerance
  • Power electronics
  • Topology

• Minimization of system-level losses in VSI-based induction motor drives: Offline strategies

  Sridharan, S. & Krein, P. T., Mar 1 2017, In: IEEE Transactions on Industry Applications. 53, 2, p. 1096-1105 10 p., 7752804.

  Research output: Contribution to journal › Article › peer-review

  • Induction motors
  • More electric aircraft
  • Torque
  • Stators

• Minimum energy and capacitance requirements for single-phase inverters and rectifiers using a ripple port

  Krein, P. T., Balog, R. S. & Mirjafari, M., Jul 3 2012, In: IEEE Transactions on Power Electronics. 27, 11, p. 4690-4698 9 p., 6145693.

  Research output: Contribution to journal › Article › peer-review

  • Energy storage
  • Capacitance
  • Capacitors
  • Electric lamps
  • Electric potential

• Near-null response to large-signal transients in an augmented buck converter: A geometric approach

  Kapat, S., Shenoy, P. S. & Krein, P. T., Apr 19 2012, In: IEEE Transactions on Power Electronics. 27, 7, p. 3319-3329 11 p., 6111490.

  Research output: Contribution to journal › Article › peer-review

  • Switching frequency
  • Bandwidth
  • Switches
  • Recovery
  • Frequency modulation

• Oscillator-based inverter control for islanded three-phase microgrids

  Johnson, B. B., Dhople, S. V., Cale, J. L., Hamadeh, A. O. & Krein, P. T., Jan 2014, In: IEEE Journal of Photovoltaics. 4, 1, p. 387-395 9 p., 6620994.

  Research output: Contribution to journal › Article › peer-review

  • Synchronization
  • oscillators
  • penetration
  • Controllers
  • Electric potential

• Recovering Partial Three-Level Operation in a T-Type Inverter with Fault Management Redundant Unit

  Wang, B., Li, Z., Dong, M., Bai, Z., Krein, P. T. & Ma, H., Sep 2020, In: IEEE Transactions on Power Electronics. 35, 9, p. 8944-8955 12 p., 8989814.

  Research output: Contribution to journal › Article › peer-review

  • Electric potential
  • Modulation
  • Networks (circuits)

• Ripple correlation control: An extremum seeking control perspective for real-time optimization

  Bazzi, A. M. & Krein, P. T., Jan 1 2014, In: IEEE Transactions on Power Electronics. 29, 2, p. 988-995 8 p., 6492253.

  Research output: Contribution to journal › Article › peer-review

  • Power electronics
  • Control theory

• Solid-state solar simulator

  Bazzi, A. M., Klein, Z., Sweeney, M., Kroeger, K. P., Shenoy, P. S. & Krein, P. T., Jul 27 2012, In: IEEE Transactions on Industry Applications. 48, 4, p. 1195-1202 8 p., 6198887.

  Research output: Contribution to journal › Article › peer-review

  • Light emitting diodes
  • Simulators
  • Color
  • Light sources
  • Solar cells

• Synchronization of nonlinear oscillators in an lti electrical power network

  Johnson, B. B., Dhople, S. V., Hamadeh, A. O. & Krein, P. T., Mar 2014, In: IEEE Transactions on Circuits and Systems I: Regular Papers. 61, 3, p. 834-844 11 p., 6701226.

  Research output: Contribution to journal › Article › peer-review

  • Synchronization
  • Acoustic impedance
  • Electric potential
  • Communication

• Synchronization of parallel single-phase inverters with virtual oscillator control

  Johnson, B. B., Dhople, S. V., Hamadeh, A. O. & Krein, P. T., Nov 2014, In: IEEE Transactions on Power Electronics. 29, 11, p. 6124-6138 15 p., 6692879.

  Research output: Contribution to journal › Article › peer-review

  • Synchronization
  • Electric potential
  • Controllers
  • Communication

• System-level optimization of switched-capacitor VRM and core for sub/near-V_t computing

  Zhang, S., Shanbhag, N. R. & Krein, P. T., Sep 1 2014, In: IEEE Transactions on Circuits and Systems II: Express Briefs. 61, 9, p. 726-730 5 p., 6837454.

  Research output: Contribution to journal › Article › peer-review

  • Capacitors
  • Voltage regulators
  • Throughput
  • Electric potential
  • Energy conservation

• System-level power loss sensitivity to various control variables in vector-controlled induction motor drives

  Bazzi, A. M., Buyukdegirmenci, V. T. & Krein, P. T., May 23 2013, In: IEEE Transactions on Industry Applications. 49, 3, p. 1367-1373 7 p., 6478795.

  Research output: Contribution to journal › Article › peer-review

  • Induction motors
  • Fluxes
  • Saturation magnetization
  • Vector control (Electric machinery)
  • Torque control

• The load as an energy asset in a distributed DC smartgrid architecture

  Balog, R. S., Weaver, W. W. & Krein, P. T., Mar 1 2012, In: IEEE Transactions on Smart Grid. 3, 1, p. 253-260 8 p., 6064918.

  Research output: Contribution to journal › Article › peer-review

  • System of systems
  • Controllers
  • Electric potential
• Chapter

  Introduction

  Krein, P. T., Jan 1 2011, Power Electronics Handbook. Elsevier Inc., p. 1-14 14 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter

  • Power electronics
  • Networks (circuits)
  • Switches
  • Semiconductor materials
  • Energy dissipation
• Conference contribution

  20x-Real time modeling and simulation of more electric aircraft thermally integrated electrical power systems

  Cao, Y., Williams, M. A., Kearbey, B. J., Smith, A. T., Krein, P. T. & Alleyne, A. G., Feb 2 2017, 2016 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles and International Transportation Electrification Conference, ESARS-ITEC 2016. Institute of Electrical and Electronics Engineers Inc., 7841416. (2016 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles and International Transportation Electrification Conference, ESARS-ITEC 2016).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • More electric aircraft
  • aircraft
  • simulation
  • system model
  • time

• A bidirectional wide load range multiphase buck/boost converter for differential power processing

  Das, D. & Krein, P. T., Aug 18 2017, 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics, COMPEL 2017. Institute of Electrical and Electronics Engineers Inc., 8013360. (2017 IEEE 18th Workshop on Control and Modeling for Power Electronics, COMPEL 2017).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Converter
  • Voltage
  • Range of data
  • Electric potential
  • Stacking

• A fast and flexible analytical approach for thermal modeling of a linear stator structure

  Buyukdegirmenci, V. T., Nategh, S., Magill, M. P. & Krein, P. T., Aug 22 2013, Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013. p. 793-800 8 p. 6556184. (Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Stators
  • Hot Temperature
  • Laplace equation
  • Poisson equation
  • Finite element method

• A high-performance permanent-magnet-free machine for wide load ranges

  Xu, L., Wang, H. & Krein, P. T., Aug 3 2017, 2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017. Institute of Electrical and Electronics Engineers Inc., 8002080. (2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Permanent magnets
  • Cobalt alloys
  • Stators
  • Fluxes
  • Torque

• Analysis of electromechanical problems using the dual-primal finite element tearing and interconnecting method

  Yao, W., Jin, J. & Krein, P. T., May 17 2012, 2012 IEEE Power and Energy Conference at Illinois, PECI 2012. 6184595. (2012 IEEE Power and Energy Conference at Illinois, PECI 2012).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Electromechanical devices
  • Magnetostatics
  • Finite element method
  • Eddy currents
  • Parallel processing systems

• An average modeling approach for mobile refrigeration hybrid power systems with improved battery simulation

  Cao, Y. & Krein, P. T., Sep 16 2013, 2013 IEEE Transportation Electrification Conference and Expo: Components, Systems, and Power Electronics - From Technology to Business and Public Policy, ITEC 2013. 6574501. (2013 IEEE Transportation Electrification Conference and Expo: Components, Systems, and Power Electronics - From Technology to Business and Public Policy, ITEC 2013).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Refrigeration
  • Hot Temperature
  • Power and Energy
  • Cost effectiveness
  • Electric power systems

• An efficient domain decomposition method for 3-D finite element analysis of nonlinear electric machine problems

  Yao, W., Jin, J. M. & Krein, P. T., Aug 22 2013, Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013. p. 709-715 7 p. 6556171. (Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Domain decomposition methods
  • Electric machinery
  • Newton-Raphson method
  • Finite element method
  • Nonlinear analysis

• An Orthogonal Decoupled Transformer Design for Inductive Power Transfer Applications

  Zhang, Z., Zheng, S., Xu, D., Krein, P. T. & Ma, H., Jun 2020, 2020 IEEE 29th International Symposium on Industrial Electronics, ISIE 2020 - Proceedings. Institute of Electrical and Electronics Engineers Inc., p. 1587-1592 6 p. 9152558. (IEEE International Symposium on Industrial Electronics; vol. 2020-June).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Technology transfer
  • Electric network topology
  • Conversion efficiency
  • Electric network analysis
  • Power transmission

• An overview of loss minimization methods in machines

  Bazzi, A. M. & Krein, P. T., 2013, Electrical Manufacturing and Coil Winding Expo 2010-2013. p. 13-18 6 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Permanent magnets
  • Physics
  • Energy conservation

• A single-stage three-phase AC module for high-voltage photovoltaics

  Johnson, B., Krein, P. T., Zheng, Z. & Lentine, A., Apr 30 2012, APEC 2012 - 27th Annual IEEE Applied Power Electronics Conference and Exposition. p. 885-891 7 p. 6165923. (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Electric potential
  • Linear regression
  • Cost reduction
  • Analytical models
  • Costs

• Augmented boost converter for near null-load transient response

  Kumar, O., Shenoy, P. S., Krein, P. T. & Kapat, S., Dec 1 2011, 2011 IEEE Power and Energy Conference at Illinois, PECI 2011. 5740478. (2011 IEEE Power and Energy Conference at Illinois, PECI 2011).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Transient analysis
  • Electric potential

• Average and detailed modeling approaches emphasizing subsystems in a hybrid mobile refrigeration

  Cao, Y. & Krein, P. T., Aug 22 2013, Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013. p. 1132-1136 5 p. 6556301. (Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Refrigeration
  • Electric machinery
  • Electric drives
  • Electric power systems
  • Hot Temperature

• Beyond time-optimality: Energy-based control of augmented buck converters for near ideal load transient response

  Shenoy, P. S., Krein, P. T. & Kapat, S., 2011, 2011 26th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2011. p. 916-922 7 p. 5744704

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Transient analysis
  • Bandwidth
  • Electric potential

• Circuit-based induction motor drive reliability under different control schemes and safe-mode operation

  Bazzi, A. M., Ding, X., Dominguez-Garcia, A. & Krein, P. T., May 13 2011, 2011 26th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2011. p. 653-660 8 p. 5744665. (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Induction motors
  • Vector control (Electric machinery)
  • Feedback linearization
  • Torque control
  • Networks (circuits)

• Comparative analysis of differential power conversion architectures and controls for solar photovoltaics

  Shenoy, P. S., Kim, K. A. & Krein, P. T., Oct 1 2012, 2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012. 6251782. (2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  • Comparative Analysis
  • Architecture
  • Energy conversion
  • Converter
  • Energy