Forbidden state space trajectories of PWM converters: implication to digital control

Author

Rahav, Gil ; Ben-yaakov, Sam

Author_Institution

Power Electron. Lab., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel

Volume

2

fYear

1999

fDate

1999

Firstpage

1199

Abstract

The possible trajectories of the state vector values (i_L(t) and v_C(t)) of buck and boost PWM converters under large transients are examined and evaluated. The forbidden trajectories, detected by examining the state space traces, impose sever limitation on the control design. These limitations are best demonstrated by investigation of large signal transient response of conventional linear controllers. Based on this investigation, a simple discrete control rule is proposed. Based on it, a preliminary simple discrete control function for a boost converter was tested and compared to a linear peak current mode (PCM) control

Keywords

DC-DC power convertors; PWM power convertors; digital control; electric current control; state-space methods; transient analysis; transient response; PWM converters; boost PWM converters; buck PWM converters; control design; conventional linear controllers; digital control; discrete control function; discrete control rule; forbidden state space trajectories; large signal transient response; large transients; linear peak current mode control; state space traces; Analog circuits; Control systems; Differential equations; Digital control; Frequency domain analysis; Phase change materials; Pulse width modulation; Pulse width modulation converters; State-space methods; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1999. PESC 99. 30th Annual IEEE

Conference_Location

Charleston, SC

ISSN

0275-9306

Print_ISBN

0-7803-5421-4

Type

conf

DOI

10.1109/PESC.1999.785664

Filename

785664