NONLINEAR OUTPUT VOLTAGE CONTROLOF PWM DC-DC CONBERTERS BY FEEDBACK LINERIZATION

  • Jo, Byeong-Rim (Image and Media Lab. LG Electronics Inc., 16 Woomyeon-Dong, Seocho-gu, Seoul, 137-140, Korea (Tel:+82-2-526-4754)) ;
  • Min, Byung-Hoon (Image and Media Lab. LG Electronics Inc., 16 Woomyeon-Dong, Seocho-gu, Seoul, 137-140, Korea (Tel:+82-2-526-4754)) ;
  • Choi, Hang-June (Image and Media Lab. LG Electronics Inc., 16 Woomyeon-Dong, Seocho-gu, Seoul, 137-140, Korea (Tel:+82-2-526-4754))
  • Published : 1995.10.01

Abstract

New output voltage control technique based on the simple feedback linearization is proposed. The system states are first divided into fast states and slow states. Then, the control stage is composed of the fast inner current control loop and the slow outer voltage control loop. From the inner loop, the average control is derived by the sliding mode concept and it is inserted into the dynamic equations of the slow states in the outer loop. Applying the feedback linearization technique to the obtained large-signal models of the PWM dc-dc converters, linearized large-signal models are obtained for the slow states. With this technique, the output voltage controller of the PWM dc-dc converters can be designed easily in the global state space and its control performance can also be much improved.