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.