A Novel SFVM-M3 Control Scheme for Interleaved CCM/DCM Boundary-Mode Boost Converter in PFC Applications

This paper presents an open-loop synchronized-OFF voltage-mode Master-made-modulated (SFVM-M-3) control scheme for a two-phase interleaved boost converter with Master-Slave strategy for power factor correction applications. Interleaving the continuous-conduction-mode and discontinuous-conduction-mode (CCM/DCM) boundary-mode boost converters, however, is complicated because of the variable-frequencies nature of the operation. Furthermore, a problem of current divergence is implied in the Slave converter. In this paper, an ON-time tuning scheme of Slave converter is presented to stabilize the interleaved converter without using a phase-lock loop, or multiplier and current sensors. It can be implemented not only by an analog circuit, but also an alternative approach, which is calculated by a digital processor such as DSP. In the following discussion, an analog circuit will be proposed to generate the M-3 control signal and verify the stability of interleaved boost converter with SFVM-M-3 control scheme, and then a digital implementation will be proposed to design the SFVM-M-3 controller.