Drive for light-emitting diodes
First Claim
1. A circuit arrangement for supplying voltage and controlling the operating behavior of at least one light-emitting diode for illumination purposes, said circuit arrangement comprising:
- at least one inverter that is connectable to a direct-voltage source and whose output frequency is variable, said inverter comprising at least two controllable power switches connected to convert a supplied direct voltage, delivered by a direct-voltage source, into a bipolar alternating voltage and a load circuit connected to an output of the inverter, said load circuit comprising a resonance element and containing at least one light-emitting diode, said load circuit connected to be driven by said bipolar alternating voltage, the switching frequency of the power switches being alterable to control the brightness of the at least one light-emitting diode.
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Accused Products
Abstract
A circuit and a method for controlling light emitting diodes (D1, D2) for illumination involve an inverter whose output frequency can be varied. The inverter includes two electronic switches (S1,S2) which convert an applied direct current voltage (Uo) into an alternating voltage. A load circuit is connected to the output of the inverter and includes a resonance element and at least one light emitting diode (D1, D2) whose brightness is controlled by altering the output frequency of the inverter.
84 Citations
20 Claims
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1. A circuit arrangement for supplying voltage and controlling the operating behavior of at least one light-emitting diode for illumination purposes, said circuit arrangement comprising:
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at least one inverter that is connectable to a direct-voltage source and whose output frequency is variable, said inverter comprising at least two controllable power switches connected to convert a supplied direct voltage, delivered by a direct-voltage source, into a bipolar alternating voltage and a load circuit connected to an output of the inverter, said load circuit comprising a resonance element and containing at least one light-emitting diode, said load circuit connected to be driven by said bipolar alternating voltage, the switching frequency of the power switches being alterable to control the brightness of the at least one light-emitting diode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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19. A method of supplying voltage and controlling the operating behavior of at least one light-emitting diode for illumination purposes, said method comprising:
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connecting at least one inverter to a direct-voltage source, said inverter having a variable output frequency and including at least two controllable power switches for converting a supplied direct voltage into an alternating voltage and connecting a load circuit to the output of the inverter, said load circuit including a resonance element and at least one light-emitting diode, said load circuit being driven by said bipolar alternating voltage, and alternating the switching frequency of said power switches to control the brightness of the at least one light-emitting diode.
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Specification