Low-cost IC less self oscillating boost PFC converter

Discontinuous conduction mode (DCM) boost power factor correction (PFC) converters have the advantages of zero-current turn-on for the boost-switch and no reverse recovery stress on boost-diode. When the converter switching frequency is constant, it has better EMI performance as well. In the proposed study, a novel approach is introduced. By using the new technique, IC´less PFC solution with less number of components is achieved. The proposed design is in DCM with constant duty and fixed frequency. The boost mosfet is driven by a transistor RC phase shift oscillator (T-RC PSO). In addition to that, IEC 61000-3-2 regulation limits have been met and the presented converter have lower bill of material (BOM) cost which is from 0.5 to 1 USD cost-down for per product compared with the IC solution.