Robust Predictive Dead-Beat Controller for Buck Converters

This paper presents a predictive dead-beat current controller which uses an online estimation of the system´s behavior. Only the measurement of inductor current is necessary for the realization. This idea also works for variable parameters of the load and of the power supply as well. Here pulse width modulation (PWM) method with constant frequency is taken into use, to limit switching losses. After a setpoint step-change, a new switch duty cycle is computed. If possible, the new setpoint is reached after one pulse period. That means, after the setpoint step-change, it takes one pulse period for the calculation and one more period to reach the final value.