Adaptive startup control method for electric drives

Details Adaptive startup control method for electric drives Adaptive startup control method for electric drives

2006-02-27

2009-02-10

Paschall, Mark H (Department: 3742)

Electric heating

Heating devices

With power supply and voltage or current regulation or...

C219S497000, C219S501000, C307S117000

Reexamination Certificate

active

07488921

ABSTRACT:
A controlled start up technique may eliminate the excessive peak junction temperature by controlling the speed of the electric device. Lower speed may result in reduced power to the load. Reduced power may result in reduced losses to maintain reliable operating junction temperatures. Once the junction reaches the predetermined temperature limit, speed may be controlled to hold the junction temperature constant. As time elapses, the coolant temperature may reduce, thereby allowing a higher power level without an increase in IGBT temperature. Unlike conventional methods which may allow for full power continuously upon start up, thereby either potentially causing a high temperature shut-down condition or requiring additional thermal inertia to handle a high heat load due to a continuous full-power start up, the controlled start up eliminates the design penalties for extensive thermal enhancements to accommodate the occasional extreme hot start up.

REFERENCES:
patent: 5909108 (1999-06-01), He et al.
patent: 6772603 (2004-08-01), Hsu et al.
patent: 2004/0124808 (2004-07-01), Hirono
patent: 2005/0253165 (2005-11-01), Pace et al.

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