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ETD Abstract Container

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PWM Buck Converter as a Dynamic Power Supply for Envelope Tracking and Amplitude Modulation

Salvatierra, Thomas R.
http://rave.ohiolink.edu/etdc/view?acc_num=wright1453826990

Abstract Details

2015, Doctor of Philosophy (PhD), Wright State University, Engineering PhD.
Modern energy transmission and signal reproduction techniques rely upon power amplifier (PA) architectures that must operate with high efficiency. Current-source PAs are linear but inherently inefficient; switch-mode PAs are efficient-yet-nonlinear systems, often lacking an efficient means of amplitude modulation (AM) for power transmission. A promising technique for addressing these problems involves replacing the fixed PA supply voltage V_dd with a controlled, variable voltage provided by a dynamic power supply. High-efficiency envelope tracking and amplitude modulation can thereby be provided to both current-source and switch-mode PAs, respectively. This work presents a pulse-width modulated (PWM) dc-dc buck converter for use as the core power stage of a dynamic supply. Although buck converters typically function as fixed-output supplies, this work provides new theoretical dc analysis for operation wherein the output voltage is controlled and variable over a wide, continuous range. A new design procedure for the variable-output PWM dc-dc buck converter is derived. The new dc analysis and design procedure are verified experimentally. Open-loop ac characteristics, such as transient response, frequency response, and dynamic modulation efficiency are assessed via simulation and experimental measurements. The variable-output buck converter is found to operate as designed, with bandwidth dependent upon a sufficiently high PWM switching frequency f_s. Within this bandwidth, minimal modulation distortion is observed, measured efficiency is greater than 90%, and supplied power-on-demand is verified.
Marian Kazimierczuk, Ph.D. (Advisor)
Saiyu Ren, Ph.D. (Committee Member)
Patrick Roblin, Ph.D. (Committee Member)
Raymond Siferd, Ph.D. (Committee Member)
LaVern Starman, Ph.D. (Committee Member)
136 p.
Electrical Engineering
dynamic power supply; PWM dc-dc buck converter; envelope tracking; amplitude modulation; AM

Recommended Citations

Citations

  • Salvatierra, T. R. (2015). PWM Buck Converter as a Dynamic Power Supply for Envelope Tracking and Amplitude Modulation [Doctoral dissertation, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1453826990

    APA Style (7th edition)

  • Salvatierra, Thomas. PWM Buck Converter as a Dynamic Power Supply for Envelope Tracking and Amplitude Modulation. 2015. Wright State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1453826990.

    MLA Style (8th edition)

  • Salvatierra, Thomas. "PWM Buck Converter as a Dynamic Power Supply for Envelope Tracking and Amplitude Modulation." Doctoral dissertation, Wright State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1453826990

    Chicago Manual of Style (17th edition)

wright1453826990
526
© 2015, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.