STMicroelectronics has patented a high-efficiency circuit and dedicated optimised power components which can reduce costs and help designers comply with the highest power-efficiency standards. The circuit and power components are suitable for boost or buck converters, usually used in solar inverters or switched-mode power supplies for computers and telecomms equipment. Legislation governing energy efficiency and power quality already requires many types of mains-powered equipment to be fitted with power factor correction circuitry to minimise energy loss and distortion. The BC2 (Back-Current Circuit) typically combines a power MOSFET, rectifier diode, inductor and a capacitor and allows economical silicon diodes to be used rather than SiC devices. The circuit removes MOSFET switching losses and recycles the energy linked to the recovery of the boost diode. Compared to a standard circuit, the topology requires one additional inductor and three optimised diodes, which is claimed to increase the efficiency by as much as 2% at approximately half the price of a solution using SiC devices. The STTH8BC060D and STTH8BC065DI, the STTH10BC065CT and the STTH16BC065CT 600 and 650V rectifier diodes, offering current ratings of 8, 10 and 16A, respectively. The STTH3BCF060U and STTH5BCF060 600V free-wheel diodes offer current ratings of 3 and 5A, respectively.
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