Drive circuit for switching element

摘要

A drive circuit is used for driving a switching element. The drive circuit includes a detection unit and an integrated circuit. The detection unit detects a state of a controlled switching element and outputs a voltage signal corresponding to a detection result of the state. The integrated circuit receives the voltage signal via an input terminal for the detection result and controls the switching element based on the received voltage signal. The input terminal includes at least two input terminals that are connected to each other so as to receive the same voltage signal from the detection unit.

主权项

1. A drive circuit for driving a switching element, comprising:
a detection unit that detects a state of a switching element targeted for being driven and outputs a voltage signal corresponding to a detection result of the state; and an integrated circuit that receives the voltage signal via an input terminal for the detection result and performs drive control of the switching element based on the received voltage signal, the input terminal including at least two input terminals that are connected to each other so as to receive the same voltage signal from the detection unit, wherein: the integrated circuit includes:
a judgment unit that judges whether or not an abnormality of driving of the switching element occurs based on the same voltage single inputted via the at least two input terminals; anda restriction unit that restricts driving of the switching element, if the judgment unit judges that the abnormality occurs; the detection unit includes a constant current source that is located at the outside of the integrated circuit, and a temperature sense diode that is located in the vicinity of the switching element; and the judgment unit judges that an abnormality occurs in the switching element, if an anode voltage of the temperature sense diode is a predetermined threshold voltage or less.