Buck converter switching scheme
First Claim
1. A circuit arrangement for igniting and operating a high-pressure discharge lamp, comprisingswitching means, inductive means and rectifying means together forming a Buck converter, connected to input terminals for connection to a supply source and output terminals for connection to the lamp for supplying the lamp with a current through periodic switching of the switching means alternately into a conducting and a non-conducting state by means of a switch-on and switch-off signal, respectively,which inductive means comprise a primary and a secondary winding, the secondary winding forming part of an integration network for generating the switch-off signal, characterized in that the secondary winding also forms part of a voltage divider circuit for generating the switch-on signal.
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Accused Products
Abstract
A circuit arrangement for igniting and operating a high-pressure discharge lamp is provided with a switching device, inductive device and a rectifier which together form a Buck converter, connected to input terminals for connection to a supply source and output terminals for connection of the lamp. The lamp is supplied with a current through periodic switching of the switching device alternatively into a conducting and a non-conducting state by means of a switch-on and switch-off signal, respectively. The inductive device includes a primary and a secondary winding with the secondary winding forming part of an integration network for generating the switch-off signal. The secondary winding also forms part of a voltage divider network for generating the switch-on signal. A very simple circuit arrangement is thereby achieved.
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Citations
17 Claims
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1. A circuit arrangement for igniting and operating a high-pressure discharge lamp, comprising
switching means, inductive means and rectifying means together forming a Buck converter, connected to input terminals for connection to a supply source and output terminals for connection to the lamp for supplying the lamp with a current through periodic switching of the switching means alternately into a conducting and a non-conducting state by means of a switch-on and switch-off signal, respectively, which inductive means comprise a primary and a secondary winding, the secondary winding forming part of an integration network for generating the switch-off signal, characterized in that the secondary winding also forms part of a voltage divider circuit for generating the switch-on signal.
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17. The circuit arrangement for igniting and operating a high-pressure discharge lamp comprising:
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a Buck converter including switching means, inductive means and rectifying means for supplying the lamp with a current through periodic switching of the switching means, the inductive means having a primary winding and a secondary winding; an integration network including the secondary winding of the inductive means for controlling the non-conductive state of the switching means; and a voltage divider circuit including the secondary winding of the inductive means for controlling the conductive state of the switching means.
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Specification