Diseño e implementación de un controlador digital tipo PID con pre-compensación para un Boost PFC de medio puente

Abstract

This paper presents a new control method for a Half-Bridge ac-dc Boost converter with power factor correction. The proposed controller includes a pre-compensation loop in order to remove the steady-state phase error in the current control loop. As a consequence, a better power factor is achieved even under soft load conditions or voltage variations in the power source. The paper explores all the stages in the design of the controller, from the derivation of the transfer function, based on an average model, the design of the controllers, a method for eliminating the voltage unbalance in the DC side, the conception and design of the pre-compensation loop, and evaluation of the effect of the precompensation loop in the stability of the system. Finally, the proposed controller is verified experimentally in a real Half-Bridge ac-dc Boost converter which is tested under different operational conditions.