Abstract:
This work proposed the sensorless nonlinear controller by using the Lyapunov direct method
for the Cuk converter. The sensorless control strategy is designed to regulate the output
voltage by considering the State-space average model and nonlinearity of the Cuk converter.
A Full state observer is proposed to estimate the capcitor voltage and inductor current using
an output voltage and a switch control signal.The state observer enables the nonlinear
controller to be realized without the inductor current sensor and makes the system low
cost and free from noise problems associated with sensor circuitry. The observer gains
are calculated using linear matrix inequality (LMI). The stability of the proposed observer
and nonlinear control is proved by the Lyapunov direct method. The accurate tracking
performance and stable operation are verified by simulation results.
