| 摘要 |
A silicon carbide diode anti-surge apparatus comprises a parallel circuit of an SIC diode in a topological alternating-current input power factor correction (PFC) circuit of a boost switch power supply BOOST. One branch of the parallel circuit comprises a main SIC diode, and the other branch of the parallel circuit comprises an auxiliary SIC diode and a turn-on threshold offset module configured to shunt surges, where the auxiliary SIC diode and the turn-on threshold offset module are connected in series. The apparatus increases a turn-on voltage drop of a parallel circuit, enables the parallel circuit not to be turned on during normal work of the circuit, protects a main SIC diode in a shunting manner only during overflowing of the surges, and solves the problem about independent heat dissipation required for a SIC diode that resists a surge impact. |
