Fluorescent lamp flashing circuit and control
First Claim
1. A fluorescent lamp flashing circuit comprising a fluorescent lamp to which is connected a heater voltage, an alternating current supply voltage source connected to said fluorescent lamp through a series connected loading reactance device which provides current limiting, a switching device to disconnect and reconnect said alternating current supply voltage source from said fluorescent lamp at a predetermined frequency rate, a control circuit to control the operation of said switching device to produce said predetermined frequency rate, and a bypass full wave rectifier bridge associated with said switching device to connect said loading reactance device in parallel with said supply voltage source and with a bleeding resistance to load said bridge and form a resonance circuit to maintain said loading reactance device constant and permitting an energy exchange between said supply voltage source and said loading reactance device in a resonant mode thereby maintaining a sine wave form and minimizing loss when said switching device is in a "closed" conductive state.
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Accused Products
Abstract
A fluorescent lamp flashing circuit is comprised of a fluorescent lamp to which an alternating supply voltage source is connected through a series connected loading reactance device which provides current limiting. The heaters of the fluorescent lamp are independently fed. A switching device disconnects and reconnects the alternating supply voltage at a predetermined frequency rate which is determined by a control circuit which controls a switching device. When the switching device is closed, the fluorescent lamp is bypassed through a full wave rectifier bridge and the reactance device is connected in parallel with the supply voltage source and with a bleeding resistance to load the bridge and to form a resonant circuit to maintain the loading reactance device constant and permitting an energy exchange between the supply voltage source and the loading reactance device in a resonant mode thereby maintaining a sine wave form and minimizing loss. When the switching device is in a non-conductive open state, the lamp is "on".
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Citations
15 Claims
- 1. A fluorescent lamp flashing circuit comprising a fluorescent lamp to which is connected a heater voltage, an alternating current supply voltage source connected to said fluorescent lamp through a series connected loading reactance device which provides current limiting, a switching device to disconnect and reconnect said alternating current supply voltage source from said fluorescent lamp at a predetermined frequency rate, a control circuit to control the operation of said switching device to produce said predetermined frequency rate, and a bypass full wave rectifier bridge associated with said switching device to connect said loading reactance device in parallel with said supply voltage source and with a bleeding resistance to load said bridge and form a resonance circuit to maintain said loading reactance device constant and permitting an energy exchange between said supply voltage source and said loading reactance device in a resonant mode thereby maintaining a sine wave form and minimizing loss when said switching device is in a "closed" conductive state.
Specification