Dynamic modeling and control of TL power amplifier using controlled source

Author

Wang, Jun ; Xu, Longxiang

Author_Institution

Coll. of Mech. & Electr. Eng., Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China

fYear

2009

fDate

17-19 June 2009

Firstpage

2146

Lastpage

2150

Abstract

The accurate closed-loop system model of Three-Level (TL) power amplifier for magnetic bearing was presented. The TL power amplifier was a nonlinear system and uncertain math model would affect the stability analysis of power amplifier. Based on the controlled source method, the nonlinear devices were replaced by controlled voltage source or controlled current source. The models of left half bridge and right half bridge were deduced. The four modes with TL control strategy were analyzed and the closed-loop system model of TL power amplifier was obtained. Simulation and experimental results were basically the same and confirmed the validity of the proposed model. The results show that the deduced model can better reflect the actual control characteristics of TL power amplifier.

Keywords

closed loop systems; magnetic bearings; nonlinear control systems; power amplifiers; stability; controlled current source; controlled source method; controlled voltage source; dynamic modeling; left half bridge; magnetic bearing; nonlinear devices; nonlinear system; right half bridge; stability analysis; three-level power amplifier; uncertain math model; Bridge circuits; Circuit simulation; Coils; Current supplies; High power amplifiers; Magnetic levitation; Nonlinear systems; Power amplifiers; Power system modeling; Voltage control; Controlled source; Magnetic bearing; Modeling; Power amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

Control and Decision Conference, 2009. CCDC '09. Chinese

Conference_Location

Guilin

Print_ISBN

978-1-4244-2722-2

Electronic_ISBN

978-1-4244-2723-9

Type

conf

DOI

10.1109/CCDC.2009.5191840

Filename

5191840