DocumentCode :
1242815
Title :
Optimal controller of a buck DC-DC converter using the uncertain load as stochastic noise
Author :
Hsieh, Fei-hu ; Yen, Nie-Zen ; Juang, Yau-Tarng
Volume :
52
Issue :
2
fYear :
2005
Firstpage :
77
Lastpage :
81
Abstract :
This work presents an optimal design approach for the pulsewidth modulation switching control of a buck DC-DC converter by modeling the converter as a stochastic linear system with noise of uncertain load. Firstly, we temporarily assume that the stochastic system is available with complete state, and then derive an optimal state feedback control for the optimal noise regulation in steady state. Secondly, from the steady-state viewpoint, the optimal state feedback control is transferred into an equivalent error-driven servo controller, and then the designed optimal control law is implemented using a phase lead-lag controller. A distinctive advantage of this approach is that the optimal controller´s parameters are actually independent of the statistics of the assumed uncertain load noise, so the benefit of optimal noise regulation is assured for global operation. Furthermore, the optimal controller is easily implemented. As a matter of fact, by just using the simplest possible operation amplifier circuits, the controller can be implemented.
Keywords :
DC-DC power convertors; PWM power convertors; linear systems; optimal control; power system control; state feedback; stochastic systems; switched mode power supplies; buck DC-DC converter; error-driven servo controller; operation amplifier circuits; optimal controller; optimal noise regulation; optimal state feedback control; phase lead-lag controller; pulsewidth modulation switching control; steady state; stochastic linear system; stochastic noise; switching power supply; uncertain load noise; Circuit noise; DC-DC power converters; Optimal control; Pulse modulation; Pulse width modulation converters; State feedback; Steady-state; Stochastic resonance; Stochastic systems; Switching converters;
fLanguage :
English
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-7747
Type :
jour
DOI :
10.1109/TCSII.2004.840113
Filename :
1396405
Link To Document :
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