Arizona State University Armando A. Rodriguez
ASU Professor 




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Low Power Electronics (DC-DC Converters)

 

This area of research focuses on the development of systematic design methods for the design and control of low cost flexible digitally implemented dc-dc converters (e.g. buck, boost, buck-boost).

Application Areas
Relevant application areas include:

  • Consumer electronics; e.g. PCs
  • Automotive electronics
  • Aerospace electronics
Relevant Control Challenges
Relevant control challenges include:
  • optimal performance-based filter design
  • filter parameter fluctuations
  • filter high frequency parasitic dynamics
  • PWM frequency/resolution selection
  • PWM constraint enforcement issues
  • switching transistor uncertainty
  • load fluctuations (i.e. output disturbances, additional parasitic dynamics)
  • line voltage fluctuations (i.e. input disturbances)
  • output voltage measurement noise
  • time delay (lag) associated with A/D
  • A/D resolution and quantization effects
  • time delay and lag associated with D/A /PWM
  • D/A/PWM resolution effects
  • lag due to anti-aliasing filter (AAF)
  • discrete-time (sample-data) controller design methodology
  • command following, disturbance attenuation, sensor noise attenuation
  • performance robustness
  • output ripple specification, load fluctuation and line voltage attenuation specifications, robustness specifications
  • controller complexity and implementation issues
  • controller coefficient sensitivity issues
  • finite precision arithmetic (word length) effects within embedded processor; e.g. field programmable gate array (FPGA)
  • controller-filter power consumption
  • power efficiency
  • controller implementation within FPGA
  • controller adaptation; e.g. model-based disturbance attenuation, frequency adaptation
  • power up issues
  • duty cycle constraint enforcement and wind-up effects
  • use of high-level rapid protoyping tools
  • fault tolerance issues
Objectives and Goals
The main objective of this research is to develop systematic methods for the design of flexible low cost digital dc-dc converters with nominal performance/robustness guarantees.

Approaches
Modern robustness and sample-data design theory.

Collaborators and Sponsors
Collaborators include: Professors Kostas Tsakalis, David Allee, Jennie Si (ASU, Electrical Engineering). This work has been supported by the National Science Foundation (NSF).

 

 

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