Title :
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
Abstract :
The possible trajectories of the state vector values (iL(t) and vC(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;
Conference_Titel :
Power Electronics Specialists Conference, 1999. PESC 99. 30th Annual IEEE
Conference_Location :
Charleston, SC
Print_ISBN :
0-7803-5421-4
DOI :
10.1109/PESC.1999.785664
