EFFICIENT ELECTRICALLY ISOLATED LIGHT SOURCES
First Claim
1. A solid-state light source comprising:
- a power input;
a rectifier connected to rectify an AC waveform presented at the power input;
a switching mode power supply having a primary side and a secondary side, the secondary side electrically isolated from the primary side, the primary side connected to receive electrical power rectified by the rectifier;
a solid-state light emitter connected to receive electrical power from the secondary side of the switching mode power supply;
a control connected to control a current being drawn by the solid-state light emitter;
a monitoring circuit connected to receive an output of the rectifier and configured to generate a signal indicative of at least one characteristic of the output of the rectifier; and
a galvanic isolator connected to carry the signal from the monitoring circuit to the controlwherein all of the secondary side of the switching mode power supply, the control and the solid-state light emitter are galvanically isolated from the monitoring circuit and the primary side of the switching mode power supply.
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Accused Products
Abstract
Solid state light sources are compatible with AC phase-cut dimmers. The light sources may have switching mode power supplies having primary and secondary sides that are in first and second circuit parts that are electrically isolated from one another. Information regarding a waveform of input electrical power is extracted in the first circuit part and passed to a controller in the second circuit part by way of a galvanic isolator. Additional isolated paths may be provided to provide bi-directional exchange of information between the first and second circuit parts and/or to provide for the exchange of additional information relevant to control. The signal path from the first side to the second side may have a low latency.
75 Citations
20 Claims
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1. A solid-state light source comprising:
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a power input; a rectifier connected to rectify an AC waveform presented at the power input; a switching mode power supply having a primary side and a secondary side, the secondary side electrically isolated from the primary side, the primary side connected to receive electrical power rectified by the rectifier; a solid-state light emitter connected to receive electrical power from the secondary side of the switching mode power supply; a control connected to control a current being drawn by the solid-state light emitter; a monitoring circuit connected to receive an output of the rectifier and configured to generate a signal indicative of at least one characteristic of the output of the rectifier; and a galvanic isolator connected to carry the signal from the monitoring circuit to the control wherein all of the secondary side of the switching mode power supply, the control and the solid-state light emitter are galvanically isolated from the monitoring circuit and the primary side of the switching mode power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification