ELECTRONIC CIRCUIT

摘要

Provided is an electronic circuit capable of preventing a switching device from breakage when a short-circuit occurs. When a gate control signal CG1 is inverted from an L level to an H level, a first switching circuit 32 selects a first input terminal a, and connects an output terminal d to the first input terminal a, whereby turning on a MOSFET 21. When a predetermined time Tx elapses after the output terminal d of the first switching circuit 32 is connected to the first input terminal a, a second switching circuit 34 selects a first input terminal e, and connects an output terminal g to the first input terminal e. Furthermore, immediately after the connection, the first switching circuit 32 selects a second input terminal b, and connects the output terminal d to the second input terminal b. Consequently, immediately after the MOSFET 21 is turned on, a gate resistor is switched from a first gate resistor 33 having a small resistance value to a second gate resistor 35 having a large resistance value.

主权项

1. An electronic circuit comprising:
a voltage control type switching device; a first gate resistor that has one end connected to a gate terminal of the voltage control type switching device; a second gate resistor that has one end connected to the gate terminal of the voltage control type switching device, and has a resistance value larger than that of the first gate resistor; and a switching circuit that switches the gate resistor such that a gate voltage is applied for a predetermined time to the gate terminal of the voltage control type switching device via the first gate resistor and then the gate voltage is applied to the gate terminal via the second gate resistor when turning on the voltage control type switching device.