Schottky diode advantages

SBD has the advantages of high switching frequency and low forward voltage, but its reverse breakdown voltage is relatively low, mostly not higher than 60V, and the maximum is only about 100V, which limits its application range. For example, the freewheeling diode of power switching device in switching power supply (SMPS) and power factor correction (PFC) circuit, high-frequency rectifier diode of more than 100V for transformer secondary, 600V-1.2kV high-speed diode in RCD buffer circuit, and 600V diode for PFC boost, only fast recovery epitaxial diode (FRED) and ultra-fast recovery diode (UFRD) are used. The reverse recovery time Trr of UFRD is also more than 20ns, which can not meet the needs of 1MHz to 3MHz SMPS in fields such as space stations. Even for the SMPS with hard switch of 100kHz, due to the large conduction loss and switching loss of UFRD, the high shell temperature and the need for large radiator, the volume and weight of SMPS are increased, which is not in line with the development trend of miniaturization and thinness. Therefore, the development of high voltage SBD above 100V has always been the subject of research and the focus of attention. In recent years, SBD has made breakthrough progress, 150V and 200V high-voltage SBDs have been listed, and more than 1kV SBDs made of new materials have also been successfully developed, thus injecting new vitality and vitality into its application.