Robust control of DC-DC converter by high-order approximate 2-degree-of-freedom digital controller

In many applications of DC-DC converters, loads cannot be specified in advance, i.e., their amplitudes are suddenly changed from the zero to the maximum rating. Generally, design conditions are changed for each load and then each controller is re-designed. Then, a so-called robust DC-DC converter wh...

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Bibliographic Details
Main Authors: Higuchi, K., Nakano, K., Kajikawa, T., Takegami, E., Tomioka, S., Watanabe, K.
Format: Conference Proceeding
Language:English
Subjects:
Analog integrated circuits
Applied sciences
Bandwidth
Computer science
control theory
systems
Control system analysis
Control theory. Systems
DC-DC power converters
Design methodology
Digital control
Digital signal processing
Electrical engineering. Electrical power engineering
Electrical machines
Exact sciences and technology
Power electronics, power supplies
Power supplies
Regulation and control
Robust control
Robustness
Voltage control
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Summary:In many applications of DC-DC converters, loads cannot be specified in advance, i.e., their amplitudes are suddenly changed from the zero to the maximum rating. Generally, design conditions are changed for each load and then each controller is re-designed. Then, a so-called robust DC-DC converter which can cover such extensive load changes and also input voltage changes with one controller is needed. Analog control IC is used usually for the controller of DC-DC converter. Simple integral control etc. is performed with the analog control IC. However it is difficult to retain sufficient robustness of DC-DC converter by these techniques. The authors proposed the method of designing an approximate 2-degree-of-freedom (2DOF) controller of DC-AC converter. This controller has an ability to attain sufficient robustness against extensive load and DC power supply changes. For applying this approximate 2DOF controller to DC-DC converter, it is necessary to improve the degree of approximation for better robustness. In this paper, we propose a method of designing high-order approximate 2DOF digital controller which makes the control bandwidth wider, and at the same time makes a variation of the output voltage very small at a sudden change of resistive load. The proposed high-order approximate 2DOF digital controller is actually implemented on a DSP and is connected to a DC-DC converter. Experimental studies demonstrate that this type digital controller can satisfy given specifications.
DOI:10.1109/IECON.2004.1431863