Driving circuit applied to insulated gate bipolar transistor (IGBT)
A technology of bipolar transistors and drive circuits, applied in electrical components, electronic switches, pulse technology, etc., can solve the problems of IGBT turn-on influence, large turn-on loss, and long IGBT turn-on time, so as to achieve optimal control and reduce turn-on time and switching loss effect
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[0094] As an optional implementation manner, the driving circuit further includes:
[0095] Equivalent inductance detection circuit, connected to the emitter and collector of the IGBT, used to detect the equivalent stray inductance L of the conductor in the IGBT S .
[0096] Because the emitter stray inductance Ls in series with the parasitic inductance is easier to measure (Ls can be measured by a double pulse test), so as long as the voltage drop on the stray inductance is close to 0 (or the voltage drop is small), then It can be known that the IGBT in the turn-on process is at i C The current rising phase is still i C Unchanging stage. Then, according to the different stages in the IGBT turn-on process, the charge and discharge speed of the parasitic capacitance inside the IGBT is controlled to achieve soft turn-on of the IGBT and shorten the turn-on time of the IGBT.
[0097] First, the stray inductance Ls needs to be measured by the double pulse test. The double pulse test circ...
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