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SCS112AGC Datasheet(PDF) 6 Page - Rohm |
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SCS112AGC Datasheet(HTML) 6 Page - Rohm |
6 / 11 page both minimum power factor and efficiency levels. n In 2004, the 80 Plus program was launched that requires 80% or higher energy efficiency at various loads (see Table 2). SiC SBDs allow power supply designers to meet high efficiency certification lev- els such as 80 Plus Bronze, Silver, or Gold. n In July 2009, the U.S. Department of Energy (DOE) ENERGY STAR v5.0 specification for com- puters that includes 80 Plus power supply effi- ciency was adopted by the European Commission and the U.S. government. SiC advantages in real-world applications SMPSs with output power ratings above 300 W typically use active PFC boost converters designed to operate in continuous conduction mode (CCM). The single big- gest advantage of using SiC diode in place of Si diode is the former’s much lower reverse recovery current (See Figure 1), which translates into approximately 60% lower switching loss and elimination (or great simplication) of the snubber circuit to control EMI. Also, the switching transistor no longer has to be derated to accommodate the large reverse current from the silicon blocking diode — a lower amperage, less expensive transistor can be used. With lower loss, the heat sink/cooling system can be made smaller. Lower switching loss allows the circuit to operate at higher frequency giving designers options to further increase efficiency and/or to reduce the choke’s size, saving cost and board space. As a practical example, consider the PFC circuit in a 1 KW AC-DC power supply with the following characteristics: n Input: 100 Vac, 60 Hz n Output: 400 Vdc, 2.5 A n Switching frequency: 50 KHz n Operating temperature: 100º C Tabel 3 summarizes the performace comparison between a circuit using a 600V Si FRD and an SiC SBD. Improvements similar to those in power supplies and PFC circuits can be obtained in other applications. For example, inverters with SiC SBDs have dramatically reduced recovery losses, resulting in improved efficiency. When used with IGBTs and lower operating frequencies, the lower thermal losses allow for smaller heat sinks. Using ROHM’s SiC SBDs, customers report improve- ments of system-level efficiency from 0.3% to 1.0%. This translates into an annual savings of over $50 for a 20 kW inverter operating at a cost of $0.10/kW-hr. For products with a long lifetime such as such as solar inverters, this provides a savings of $750 in 15 years or $1500 in 30 years. 80 PLUS Test Type 115V Internal Non-Redundant 230V Internal Redundant Percent of Rated Load 20% 50% 100% 20% 50% 100% 80 PLUS Basic 80% 80% 80% Not defined Bronze 82% 85% 82% 81% 85% 81% Silver 85% 88% 85% 85% 89% 85% Gold 87% 90% 87% 88% 92% 88% Platinum 90% 92% 89% 90% 94% 91% Table 2. 80 PLUS Efficiency Levels. Per ENERGY STAR 5.0, desktop computer, laptop computer or server power supplies must comply with the Bronze level. Source: Wikipedia. Table 3. Performance comparison between circuits using 600 V / 20 A Si-FRD and ROHM 600 V / 10A SBD (SCS110AG). Si-FRD ROHM SiC SBD Peak reverse current 56 A 14 A Power conversion efficiency 93.13% 95.57% Harmonic distortion 2.42% 2.36% ROHM Semiconductor SiC Schottky Barrier Diodes 5 |
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