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US 5,291,299 AGranted
Power supply and control unit for a light system and a lighting unit for the light system
AssigneeIdman Oy
InventorJuhani Karna
Life of this patent
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AssigneeIdman Oy
InventorJuhani Karna
Estimating the term…
The invention relates to a power supply and control unit for a light system, especially an airport approach light system, for making a number of lights go on and out as a progressive light front. The invention is also concerned with a lighting unit (1) suitable for use in combination with this power supply and control unit. To minimize the need for cable laying especially for the light system, the power supply and control unit comprises means (2) for generating clock pulses (b) occurring at a frequency proportional to the rate of progression of the light front; means (3) for generating a control signal (c) comprising recurrent sequences containing a predetermined number of control pulses corresponding to the frequency of the clock pulses and a subsequent portion comprising no control pulses and having a duration equal to one or more cycle times corresponding to the frequency of the clock pulses; and a power stage (4) which is arranged to receive the control signal (c) and a supply (s) from a source of power and to generate at its output voltage pulses (v) in response to the control pulses of the control signal on the basis of said control signal and supply.
A power supply and control apparatus for a sequenced flashing light system of predetermined frequency, not related to a system line frequency, for making a number of lights flash `on` and `off` as for an airport approach light system, said power supply and control apparatus comprising:
The power supply and control apparatus of claim 11, wherein the duration of said subsequent portion having no pulses is at least two cycles.
A lighting unit assembly for use with a sequenced flashing light system as for an airport approach light system, said lighting unit assembly including a lamp, such as a xenon lamp, and a triggering circuit for lighting the lamp in response to a supply voltage signal from the sequenced flashing light system, the supply voltage signal including recurrent sequences each comprising a first portion having a predetermined number of voltage pulses and a subsequent portion comprising no voltage pulses but having a duration of at least one cycle which value also corresponds to a frequency of the voltage pulses, this frequency not being related to a system line frequency, the lighting unit assembly further comprising:
Dependencies are inferred from the claim text.