Conversor CA-CC monofásico com dupla modulação, PFC, de estágio único e com desacoplamento de potência

Abstract

AC-DC converters are used in equipment in all sectors of the economy, from industrial, commercial and residential use. They are used for rectification in high-power applications, such as in uninterruptible power supply systems, power supplies, and electric car battery charging systems, and in lower powers, such as computer and cell phone chargers or driving power lighting systems. These converters must meet current standards regarding power factor and total current harmonic distortion rates, as the insertion of harmonic contents into electrical systems can cause several problems. In this way, numerous rectifier topologies can be seen in the specialized literature, and there is an incessant search for topologies that provide such characteristics together with high performance. The latest studies direct topologies to adopt a single stage responsible for correcting power factor, controlling the output voltage, and performing power decoupling, which is inherent to single-phase AC-DC converters. Many topologies presented in the literature use auxiliary circuits to eliminate ripples at 120 Hz from the output, which increases converter costs. In this work, a new topology of an AC-DC converter is presented, which is based on the half-bridge power factor correction activated converter and the DC-DC converter with soft switching. This unprecedented topology has a single stage, operates with double modulation, is isolated, and has power decoupling without adding new components to the circuit. Simulation and experimental results show that the proposed topology meets current standards regarding power factor and harmonic distortion rates for different power values. Furthermore, as the topology employs two input inductors, the current efforts in the switches are lower due to the more uniform distribution of the current in them. Additionally, the converter has excellent potential to work with smaller capacitors on the DC bus and in the output filter due to the low ripples at 120 Hz in the output voltage.