Patent ID: 7956646

Claim:
A buffer circuit comprising: a driving portion which drives an output switching element; a detecting portion which detects that a voltage value of a control terminal of the output switching element has exceeded a threshold voltage value; and an auxiliary driving portion connected to the driving portion, wherein: the auxiliary driving portion changes driving capability of the output switching element so as to decrease, in case a signal received by the driving portion changes from low level to high level or in case the signal changes from high level to low level, in accordance with a result of detection by the detecting portion, and the detecting portion is provided with: a first switching element having an element structure same as the output switching element, wherein the first switching element has a first control terminal which is connected to the control terminal of the output switching element; and a first resistor element arranged between a power supply and a ground, wherein the first resistor element is serially connected to the first switching element.