Advantages of Schottky diode

SBD has the advantages of high switching frequency and low forward voltage, but its reverse breakdown voltage is relatively low, most of which is not higher than 60V, and the highest is only about 100V, which limits its application range. For example, in switching power supply (SMPS) and power factor correction (PFC) circuits, only fast recovery epitaxial diode (Fred) and ultra fast recovery diode (ufrd) are used, such as freewheeling diode of power switching device, high-frequency rectifier diode of more than 100V for transformer secondary, high-speed diode of 600v-1.2kv for RCD buffer circuit and 600V diode for PFC boost. The reverse recovery time TRR of ufrd is also more than 20ns, which can not meet the needs of 1mhz-3mhz SMPS in fields such as space station. Even for SMPS with a hard switch of 100kHz, due to the large conduction loss and switching loss of ufrd and the high shell temperature, a large heat sink is required, which increases the volume and weight of SMPS and does not conform to the development trend of miniaturization and lightness. Therefore, the development of high voltage SBD above 100V has always been a research topic and a focus of attention. In recent years, SBD has made breakthrough progress. 150V and 200V high-voltage SBD have been listed, and more than 1kV SBD made of new materials has been successfully developed, thus injecting new vitality and vigor into its application.