Switch circuit capable of overcurrent protection with small and simple circuit, and with simple operation, without affecting normal operation

A power converter apparatus comprising at least one switch circuit, the at least one switch circuit comprising:

• a first switch element that has a first terminal connected to a first voltage source, a second terminal connected to a second voltage source, and a third terminal;
• a driver circuit that generates a first control signal for turning the first switch element;
• a first resistor that is connected between the driver circuit and the third terminal on and off;
• a second switch element that has a fourth terminal connected to the third terminal, a fifth terminal connected to the second voltage source, and a sixth terminal;
• an overcurrent detector circuit that generates a second control signal for turning the second switch element on and off, based on whether or not a current flowing through the first switch element exceeds a predetermined threshold;
• and
• a second resistor that is connected between the overcurrent detector circuit and the sixth terminal,
• wherein the first and second resistors have resistances configured such that a turn-off time of the first switch element when the second switch element is turned on by the second control signal is longer than a turn-off time of the first switch element when the first switch element is turned off by the first control signal.