Electricity: electrical systems and devices – Electrostatic capacitors – With protection or compensating means
Reexamination Certificate
2007-03-13
2008-12-30
Thomas, Eric (Department: 2831)
Electricity: electrical systems and devices
Electrostatic capacitors
With protection or compensating means
C361S272000, C361S275400
Reexamination Certificate
active
07471498
ABSTRACT:
A capacitor having a large current carrying capacity includes a hollow core formed by a non-conducting tubular section, and a capacitor winding wrapped around the tubular section. A thermal cutoff device is disposed within the hollow core. The thermal cutoff device is configured to sense a predetermined temperature level within the hollow core and disable the current carrying capacity of the capacitor. The thermal cutoff device is disposed at a geometric center of the capacitor winding, which is also the hot spot of the capacitor winding. The thermal cutoff device includes first and second conductors electrically connected to each other with a predetermined solder alloy. The first conductor includes a cross-sectional portion that is attached to the second conductor. The cross-sectional portion is subjected to a springing force in a lateral direction away from the second conductor. Upon melting of the solder alloy, the springing force moves the cross-sectional portion away from the second conductor, thereby disabling the current carrying capacity of the capacitor.
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International Search Report, Appln. No. PCT/US07/06456 dated Mar. 15, 2007.
Curto David
Lavene Bernard
Schach Alan
Electronic Concepts Inc.
RatnerPrestia
Sinclair David M
Thomas Eric
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