Circuit for reducing switching noise in electronic switch e.g. for use in vehicle, has switching transistor with parasitic diode acting as free-running diode damping circuit(s) in parallel with switching path

摘要

The circuit has a switching transistor (G,S,D) with a control electrode and a switching path with a parasitic diode (FD) parallel to the switching path acting as a free-running diode. At least one damping circuit with a series circuit containing an Ohmic resistance (RS), capacitance (CS) and inductance (LS) is also connected in parallel with the switching path. The switching transistor is a Power-MOSFET.