The Experts below are selected from a list of 6231 Experts worldwide ranked by ideXlab platform

Michael A E Andersen - One of the best experts on this subject based on the ideXlab platform.

  • ultrafast tracking power supply with fourth order Output filter and fixed frequency hysteretic control
    IEEE Transactions on Power Electronics, 2008
    Co-Authors: M C W Hoyerby, Michael A E Andersen
    Abstract:

    A practical solution is presented for the design of a non-isolated dc/dc power converter with very low Output Ripple Voltage and very fast Output Voltage step response. The converter is intended for use as an envelope tracking power supply for a radio frequency power amplifier (RFPA) in a TETRA enhanced data service (TEDS) base station. A simple and effective fixed-frequency hysteretic control scheme for the converter (buck with fourth-order Output filter) is developed and analyzed. The proposed approach is verified experimentally by a 500 W Output prototype, capable of delivering any Voltage in the range of 10-30 V within 10 mus with 10 mVpp of Output Ripple and efficiencies in the 88%-95% range.

  • ultrafast tracking power supply with fourth order Output filter and fixed frequency hysteretic control
    IEEE Transactions on Power Electronics, 2008
    Co-Authors: M C W Hoyerby, Michael A E Andersen
    Abstract:

    A practical solution is presented for the design of a non-isolated dc/dc power converter with very low Output Ripple Voltage and very fast Output Voltage step response. The converter is intended for use as an envelope tracking power supply for a radio frequency power amplifier (RFPA) in a TETRA enhanced data service (TEDS) base station. A simple and effective fixed-frequency hysteretic control scheme for the converter (buck with fourth-order Output filter) is developed and analyzed. The proposed approach is verified experimentally by a 500 W Output prototype, capable of delivering any Voltage in the range of 10-30 V within 10 mus with 10 mVpp of Output Ripple and efficiencies in the 88%-95% range.

  • envelope tracking power supply with fully controlled 4th order Output filter
    Applied Power Electronics Conference, 2006
    Co-Authors: M C W Hoyerby, Michael A E Andersen
    Abstract:

    This paper describes the derivation of a practical solution to designing a medium-power non-isolated DC/DC power converter with very low Output Ripple Voltage and very high Output Voltage slew-rate capability. The converter is intended for powering and efficiency-optimizing an RFPA (Radio Frequency Power Amplifier) in a communications system base station. A simple and effective analog control scheme for the converter (buck with 4th order Output filter) is developed, along with an accurate linear model The proposed approach is verified experimentally by a 500W Output prototype, capable of greater than 1 V//spl mu/s slew rate with 40mVpp of Output Ripple and efficiency above 90%.

M C W Hoyerby - One of the best experts on this subject based on the ideXlab platform.

  • ultrafast tracking power supply with fourth order Output filter and fixed frequency hysteretic control
    IEEE Transactions on Power Electronics, 2008
    Co-Authors: M C W Hoyerby, Michael A E Andersen
    Abstract:

    A practical solution is presented for the design of a non-isolated dc/dc power converter with very low Output Ripple Voltage and very fast Output Voltage step response. The converter is intended for use as an envelope tracking power supply for a radio frequency power amplifier (RFPA) in a TETRA enhanced data service (TEDS) base station. A simple and effective fixed-frequency hysteretic control scheme for the converter (buck with fourth-order Output filter) is developed and analyzed. The proposed approach is verified experimentally by a 500 W Output prototype, capable of delivering any Voltage in the range of 10-30 V within 10 mus with 10 mVpp of Output Ripple and efficiencies in the 88%-95% range.

  • ultrafast tracking power supply with fourth order Output filter and fixed frequency hysteretic control
    IEEE Transactions on Power Electronics, 2008
    Co-Authors: M C W Hoyerby, Michael A E Andersen
    Abstract:

    A practical solution is presented for the design of a non-isolated dc/dc power converter with very low Output Ripple Voltage and very fast Output Voltage step response. The converter is intended for use as an envelope tracking power supply for a radio frequency power amplifier (RFPA) in a TETRA enhanced data service (TEDS) base station. A simple and effective fixed-frequency hysteretic control scheme for the converter (buck with fourth-order Output filter) is developed and analyzed. The proposed approach is verified experimentally by a 500 W Output prototype, capable of delivering any Voltage in the range of 10-30 V within 10 mus with 10 mVpp of Output Ripple and efficiencies in the 88%-95% range.

  • envelope tracking power supply with fully controlled 4th order Output filter
    Applied Power Electronics Conference, 2006
    Co-Authors: M C W Hoyerby, Michael A E Andersen
    Abstract:

    This paper describes the derivation of a practical solution to designing a medium-power non-isolated DC/DC power converter with very low Output Ripple Voltage and very high Output Voltage slew-rate capability. The converter is intended for powering and efficiency-optimizing an RFPA (Radio Frequency Power Amplifier) in a communications system base station. A simple and effective analog control scheme for the converter (buck with 4th order Output filter) is developed, along with an accurate linear model The proposed approach is verified experimentally by a 500W Output prototype, capable of greater than 1 V//spl mu/s slew rate with 40mVpp of Output Ripple and efficiency above 90%.

Huang Sheng-hua - One of the best experts on this subject based on the ideXlab platform.

  • Design of Low Output Ripple Voltage 28V/400A DC Power Supply
    IEEE Transactions on Power Electronics, 2007
    Co-Authors: Huang Sheng-hua
    Abstract:

    The limited double pole control method of full-bridge PWM converter is presented.The 28V/400A soft switching DC power supply is designed according to mentioned method.The principle of soft switching and peak current mode control method are analyzed.The current sharing circuit is designed also.How to reduce the DC Output Voltage Ripple is disscussed.The main circuit parameter and the experimental result are given at the end of this paper.

James D. Scofield - One of the best experts on this subject based on the ideXlab platform.

  • A comprehensive multi-mode performance analysis of interleaved boost converters
    2010 IEEE Energy Conversion Congress and Exposition, 2010
    Co-Authors: Biswajit Ray, Hiroyuki Kosai, Seana Mcneal, Brett Jordan, James D. Scofield
    Abstract:

    Interleaved power converter topologies have received increasing attention in recent years for high performance applications. In this paper, a comprehensive multi-mode performance analysis is presented for interleaved boost converters operating over the entire duty ratio range (0 ≤ switch duty ratio ≤ 1) under the continuous conduction mode (CCM) and two discontinuous conduction modes (DCMs). With inductor coupling factor and converter loading as parameters, key performance indicators such as the dc Voltage gain, input Ripple current, inductor Ripple current, and Output Ripple Voltage are presented in a normalized form to aid the converter design process. Transitions among the CCM and two DCM modes are clearly defined for the entire switch duty ratio range. Advantages of DCM operation such as reduced switching loss at the expense of undesired ringing are discussed. The comprehensive multi-mode analysis has been experimentally verified using a 250 W, 70 kHz prototype converter unit.

  • Performance analysis of a multi-mode interleaved boost converter
    2009 IEEE Energy Conversion Congress and Exposition, 2009
    Co-Authors: Biswajit Ray, Hiroyuki Kosai, Seana Mcneal, Brett Jordan, James D. Scofield
    Abstract:

    Interleaved power converter topologies have received increasing attention in recent years for high performance applications. The advantages of coupled interleaved boost converters include increased efficiency, reduced size, reduced electromagnetic emission, faster transient response, and improved reliability. In this paper, a comprehensive performance analysis is presented for a multimode interleaved boost converter operating under the continuous conduction mode (CCM) and two discontinuous conduction modes (DCMs). With inductor coupling factor and converter loading as parameters, key performance indicators such as the dc Voltage gain, input Ripple current, inductor Ripple current, and Output Ripple Voltage are presented in a normalized form to aid the converter design process. Transitions among the CCM and two DCM modes are clearly defined as part of the analysis. Advantages of DCM operation such as reduced switching loss at the expense of undesired ringing are discussed. The analysis presented is experimentally verified using a 250 W, 70 kHz prototype converter unit.

Gabriel A Rinconmora - One of the best experts on this subject based on the ideXlab platform.

  • an accurate low Voltage cmos switching power supply with adaptive on time pulse frequency modulation pfm control
    IEEE Transactions on Circuits and Systems, 2007
    Co-Authors: B Sahu, Gabriel A Rinconmora
    Abstract:

    Integrated switching power supplies with multimode control are gaining popularity in state-of-the-art portable applications like cellular phones, personal digital assistants (PDAs), etc., because of their ability to adapt to various loading conditions and therefore achieve high efficiency over a wide load-current range, which is critical for extended battery life. Constant-frequency, pulsewidth modulated (PWM) switching converters, for instance, have poor light-load efficiencies because of higher switching losses while pulse-frequency modulation (PFM) control in discontinuous-conduction mode (DCM) is more efficient at light loads because the switching frequency and associated switching losses are scaled down with load current. This paper presents the design and integrated circuit prototype results of an 83% power efficient 0.5-V 50-mA CMOS PFM buck (step-down) dc-dc converter with a novel adaptive on-time scheme that generates a 27-mV Output Ripple Voltage from a 1.4- to 4.2-V input supply (battery-compatible range). The Output Ripple Voltage variation and steady-state accuracy of the proposed supply was 5 mV (22-27 mV) and 0.6% whereas its constant on-time counterpart was 45 mV (10-55 mV) and 3.6%, respectively. The proposed control scheme provides an accurate power supply while achieving 2%-10% higher power efficiency than conventional fixed on-time schemes with little circuit complexity added, which is critical during light-loading conditions, where quiescent current plays a pivotal role in determining efficiency and battery-life performance