The rapid escalation of electrical content in current and futureautomotive applications has necessitated the need for significantincreases in electrical power. To meet this demand, automotivemanufacturers are developing 42 volt power distribution systems. 42volts will better meet the power requirements of these, new features andalso permit the electrification of ancillaries up to approximately 10 kWwhich the present 14 volt power systems cannot practically andeconomically provide. However, the introduction of higher voltage powersystems creates new challenges in regards to circuit protection fromvoltage transients produced from switched loads. This paper focuses onthe transients produced by switching inductive loads on 14 and 42 voltsystems. A complete analysis is performed on 14 and 42 volt door lockmotors for three different types of switches. Measurements were alsomade on 14 and 42 volt window motors and air conditioning clutch coils.All measurements are compared to simulated results. This work builds onprevious studies of prediction of switch arcing. The results of thisstudy are used to develop new conducted immunity standards forautomotive products
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