Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1996-02-29
1998-04-14
Elms, Richard T.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 43, 307 87, H02J 700
Patent
active
057395950
ABSTRACT:
A cable TV distribution system in which an AC power signal is generated according to the following steps: (a) generating an AC power signal having at least a positive half-cycle, where the positive half-cycle comprises a rising portion, a falling portion, and a central portion; and (b) limiting the slew rate of the AC power signal within the rising portion to a range of 30 V/ms and 50 V/ms inclusive. Preferably, the slew rate of the AC power signal within the falling portion is limited to the range of -30 V/ms and -50 V/ms inclusive. The AC power signal is preferably generated by a power supply comprising: (a) a ferroresonant transformer; (b) a ferro-capacitor connected across the first and second terminals of the output windings of the ferroresonant transformer; (c) an inductor connected across the first and second terminals in parallel with the ferro-capacitor; (d) a switch for preventing current flow through the inductor in response to a switch control signal; and (e) a control circuit for generating the switch control signal to obtain the desired AC power signal.
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Kennedy Brian M.
Mekanik Fereydoun
Osterman Thomas S.
Alpha Technologies, Inc.
Elms Richard T.
Kaplan Jonathan
Schacht Michael R.
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