Overview
Switch-mode power supplies, uninterruptible power supplies and active power-factor-correction front ends convert and condition large amounts of electrical power, and the quality of the power stage determines both efficiency and reliability. In these applications, switching loss dominates at high frequency, so wide-bandgap devices let a designer raise the frequency without paying a loss penalty. Cree SiC MOSFETs and Schottky diodes fit this space well, and BeiLuo supplies them with genuine traceability and FAE support.
Active Power-Factor Correction
Modern supplies draw near-sinusoidal current to meet harmonic limits, using an active PFC front end that switches at high frequency and handles the full input power. A boost converter built around a C3M0016120K SiC MOSFET and a C4D10120A SiC Schottky diode corrects the power factor with low loss and low EMI. Because the SiC diode has no reverse-recovery charge, the boost stage switches cleanly at high frequency, which shrinks the boost inductor and the input filter and reduces the recovery noise that would otherwise require a snubber. The result is a compact, compliant front end.
Harmonics and Control
The PFC control loop shapes the input current to follow the input voltage, so the current waveform must be controlled precisely and the power stage must switch predictably. A clean switching edge and a low-inductance layout reduce the high-frequency content that would otherwise require a larger input filter. SiC's fast, temperature-independent switching makes the loop easier to stabilize across the operating range.
High-Frequency SMPS
Above a certain frequency, silicon IGBT or MOSFET switching loss becomes impractical and a SiC MOSFET is the better choice. A SiC MOSFET can switch at high frequency with low loss and clean edges, so the transformer and filter magnetics shrink dramatically, raising power density in a supply that must fit a rack or an enclosure. The four-lead package helps control the fast edges, and the robust body diode keeps the freewheeling path manageable.
UPS Power Stages
A UPS rectifies mains power, stores it in a battery and inverts it to a clean output, switching between modes seamlessly. Both the rectifier and the inverter benefit from SiC, and the diode's positive temperature coefficient allows paralleling for higher current without thermal runaway. The result is a more efficient UPS with a smaller thermal design.
Selection and Supply
Selection starts with the input and output levels and the switching frequency, then narrows by on-resistance, package and cost, with the diode matched to the rectification and freewheeling duty. BeiLuo keeps mainstream Cree SiC MOSFET and diode models in regional stock, ships them with import declaration, certificate of origin and RoHS documents, and supports device selection, gate drive and thermal design with an in-house FAE team. From a compact PFC front end to a large UPS power stage, our engineers help you choose the SiC devices that keep the converter efficient, dense and protected.