Apparatus for supplying electrical power to an arc lamp including resonant circuit
First Claim
1. An apparatus for supplying electrical power to an arc lamp from an electrical power source comprising:
- a primary winding and first and second secondary windings magnetically coupled to said primary winding, the first of said secondary windings being connected to continuously apply a relatively high voltage to said arc lamp to strike an arc therein, and the second of said secondary windings being connected to supply a relatively low voltage to said arc lamp to operate said arc lamp after said arc has been struck;
a capacitor connected to form a high frequency resonant circuit including said primary winding;
switching means for controllably connecting said resonant circuit to said power source;
first unidirectional conducting means for connecting said first secondary winding across said arc lamp to conduct current therethrough in a first direction; and
second unidirectional conducting means for connecting said second secondary winding across said arc lamp to conduct current therethrough in said first direction;
said first and second unidirectional conducting means serving to prevent the first and second secondary windings from short-circuiting together at the moment of striking the arc.
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Accused Products
Abstract
This generator for supplying high-frequency power to an arc lamp (12), coises:
a primary circuit (1) connected up to the terminals (5, 6) of the power-supply mains and incorporating an electromagnetic inductor (L'"'"', T) connected to a resonant circuit (7);
a secondary circuit (2) comprising, in series, the arc lamp (12) and an electromagnetic sensor (E1, E2) making it possible to provide magnetic coupling with the primary circuit (1) at high frequency.
The secondary circuit (2) is formed by two electrical circuits (10, 11) mounted in parallel with the terminals of the lamp (12), each of the two circuits incorporating an electromagnetic sensor coupled with the electromagnetic inductor of the primary circuit (1).
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Citations
12 Claims
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1. An apparatus for supplying electrical power to an arc lamp from an electrical power source comprising:
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a primary winding and first and second secondary windings magnetically coupled to said primary winding, the first of said secondary windings being connected to continuously apply a relatively high voltage to said arc lamp to strike an arc therein, and the second of said secondary windings being connected to supply a relatively low voltage to said arc lamp to operate said arc lamp after said arc has been struck; a capacitor connected to form a high frequency resonant circuit including said primary winding; switching means for controllably connecting said resonant circuit to said power source; first unidirectional conducting means for connecting said first secondary winding across said arc lamp to conduct current therethrough in a first direction; and second unidirectional conducting means for connecting said second secondary winding across said arc lamp to conduct current therethrough in said first direction; said first and second unidirectional conducting means serving to prevent the first and second secondary windings from short-circuiting together at the moment of striking the arc. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for supplying electrical power to an arc lamp from an electrical power source comprising:
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a first half bridge circuit including a first switch and a first capacitor connected to said source; a second half bridge circuit including a second switch and a second capacitor connected to said source; a primary winding and first and second secondary windings magnetically coupled to said primary winding, the first of said secondary windings being connected to continuously apply a relatively high voltage to said arc lamp to strike an arc therein, and the second of said secondary windings being connected to supply a relatively low voltage to said arc lamp to operate said lamp after said arc has been struck; an inductor for connecting said primary winding to said first and second half bridge circuits, said inductor and primary winding forming a first series resonant circuit with said first capacitor when said first switch is conducting, and forming a second series resonant circuit with said second capacitor when said second switch is conducting; first unidirectional conducting means for connecting said first secondary winding across said arc lamp to conduct current therethrough in a first direction; and second unidirectional conducting means for connecting said second secondary winding across said arc lamp to conduct current therethrough in said first direction; said first and second unidirectional conducting means serving to prevent the first and second secondary windings from short circuiting together at the moment of striking the arc.
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Specification