Semiconductor oscillation suppression circuit

A semiconductor oscillation suppression circuit comprising:

• a first wide-bandgap semiconductor element having a source and a drain;
• a free-wheeling diode connected in inverse-parallel with the first wide-bandgap semiconductor element;
• a first capacitor connected to the first wide-bandgap semiconductor element in parallel and having a larger capacity than a junction capacitance of the first wide-bandgap semiconductor element;
• a second diode connected to the first wide-bandgap semiconductor element in parallel, and in series with the first capacitor;
• a power supply configured to supply power to the first wide-bandgap semiconductor element;
• and
• a second wide-bandgap semiconductor element connected to the first wide-bandgap semiconductor element in series between a positive electrode side and a negative electrode side of the power supply,
• wherein
• a cathode of the free-wheeling diode is connected to the drain of the first wide-bandgap semiconductor element and an anode of the second diode,
• a cathode of the second diode is connected to one electrode of the first capacitor,
• the other electrode of the first capacitor is connected to the source of the first wide-bandgap semiconductor element and an anode of the free-wheeling diode,
• the first wide-bandgap semiconductor element is connected to the positive electrode side of the power supply,
• the second wide-bandgap semiconductor element is connected to the negative electrode side of the power supply, and
• a charging speed of the first capacitor being suppressed by the voltage increase rate of the first wide-bandgap semiconductor element as the first wide-bandgap semiconductor element is turned off.