Stroboscopic beacons fed from a capacitive source
First Claim
1. A system for feeding flash-tubes of beacons with the capacitive energy extracted from an insulated section of an overhead wire of an AC power transmission line, comprising:
- means for transforming said capacitive energy from the overhead wire into a DC voltage to feed at least one of said flash tubes;
regulation means coupled in shunt to said transforming means for controlling the DC voltage supply to said flash-tubes, regulation means comprising a switching circuit for relating said DC voltage according to a predetermined value and a detection circuit operative to control actuation of said switching circuit when said predetermined DC voltage value is reached; and
means for generating at a predetermined frequency pulses for firing said at least one flash-tube when said flash-tube is under said DC voltage regulated by said regulation means.
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Accused Products
Abstract
The present invention relates to a system for energizing flash-tubes of beacons by means of the capacitive energy extracted from an insulated section of the overhead wire of power transmission lines. The supply system comprises a circuit for transforming the AC capacitive energy from the overhead wire into DC voltage, the latter feeding at least one flash-tube and a regulation circuit shunted across the transforming circuit for controlling a DC voltage threshold value supplying the tubes. Such regulation is achieved by detecting the predetermined DC voltage threshold value across the lamp terminals and by switching to the earth any capacitive energy extracted from the overhead wire exceeding that threshold value. Moreover, a circuit delivers a pulse at predetermined time intervals to control the firing of each flash-tube when the latter is subjected to a DC voltage corresponding to the predetermined threshold value and regulated by shunt switching.
52 Citations
15 Claims
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1. A system for feeding flash-tubes of beacons with the capacitive energy extracted from an insulated section of an overhead wire of an AC power transmission line, comprising:
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means for transforming said capacitive energy from the overhead wire into a DC voltage to feed at least one of said flash tubes; regulation means coupled in shunt to said transforming means for controlling the DC voltage supply to said flash-tubes, regulation means comprising a switching circuit for relating said DC voltage according to a predetermined value and a detection circuit operative to control actuation of said switching circuit when said predetermined DC voltage value is reached; and means for generating at a predetermined frequency pulses for firing said at least one flash-tube when said flash-tube is under said DC voltage regulated by said regulation means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of feeding flash-tubes of beacons with a capacitive energy source supplied by a section of an overhead wire of an AC power transmission line, said method comprising the steps of:
- insulating against ground said overhead wire section;
extracting the AC energy generated by said overhead wire section;
transforming said AC energy into DC voltage for feeding at least one of said flash-tubes;
detecting the value of said DC voltage supplied to each flash-tube;
shorting to ground said energy from the overhead wire through a shunt switching circuit when said DC voltage value reaches a predetermined threshold value; and
firing each flash-tube under said predetermined DC voltage threshold value by means of a corresponding pulse generating circuit. - View Dependent Claims (14, 15)
- insulating against ground said overhead wire section;
Specification