Resonant power LED control circuit with brightness and color control
First Claim
1. A resonant power LED control apparatus comprising a single resonant converter configured to provide simultaneous, independent brightness and color control of two LEDs or two groups of LEDs, wherein the converter comprises a half or full bridge DC/AC converter with a control unit, a resonant capacitor, and a transformer, wherein at least one first LED of the two LEDs or two groups of LEDs conducts a first current only during a positive half-cycle of a secondary voltage across at least one secondary winding of the transformer, and at least one second LED of the two LEDs or two groups of LEDs conducts a second current only during a negative half-cycle of the secondary voltage.
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Accused Products
Abstract
The invention relates to a resonant power LED control circuit for the independent, simultaneous brightness and color or color temperature control of two LEDs (41, 42) or two groups of LEDs, comprising a single resonant converter which is essentially formed from a half or full bridge DC/AC converter (2) with a control unit (21), a resonant capacitor, and a transformer (3).
80 Citations
19 Claims
- 1. A resonant power LED control apparatus comprising a single resonant converter configured to provide simultaneous, independent brightness and color control of two LEDs or two groups of LEDs, wherein the converter comprises a half or full bridge DC/AC converter with a control unit, a resonant capacitor, and a transformer, wherein at least one first LED of the two LEDs or two groups of LEDs conducts a first current only during a positive half-cycle of a secondary voltage across at least one secondary winding of the transformer, and at least one second LED of the two LEDs or two groups of LEDs conducts a second current only during a negative half-cycle of the secondary voltage.
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10. An apparatus, comprising:
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a transformer having a primary winding and at least one secondary winding; at least one first light source coupled to the at least one secondary winding so as to conduct a first secondary current and thereby generate first light only during a positive half-cycle of a secondary voltage across the at least one secondary winding; at least one second light source coupled to the at least one secondary winding so as to conduct a second secondary current and thereby generate second light only during a negative half-cycle of the secondary voltage; a resonance circuit coupled to the primary winding for providing a resonance current through the primary winding; and a controller coupled to the resonance circuit for providing to the resonance circuit at least one control signal having a variable duty cycle, wherein; the resonance current is based at least in part on the variable duty cycle of the at least one control signal; and the variable duty cycle of the at least one control signal is based at least in part on at least one of a first feedback signal associated with the at least one first light source and a second feedback signal associated with the at least one second light source. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An apparatus, comprising:
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at least one first light source coupled to at least one secondary winding of a transformer so as to conduct a first secondary current and thereby generate first light only during a positive half-cycle of a secondary voltage across the at least one secondary winding; at least one second light source coupled to the at least one secondary winding so as to conduct a second secondary current and thereby generate second light only during a negative half-cycle of the secondary voltage; and at least one third light source coupled to the at least one secondary winding so as to conduct a third secondary current and thereby generate third light during both the positive half-cycle and negative half-cycle of the secondary voltage. - View Dependent Claims (18, 19)
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Specification