Programmable feed-forward regulation
AssigneeOsram Sylvania Inc.
InventorsEliseo Carcamo Olmos, Luis Manuel Leon Lara
Life of this patent
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Abstract
Programmable drivers (or power supplies) for solid state light sources are disclosed, on which output regulation is improved to expand the dimming range to 1% and reduce and/or remove flicker. Additional fault conditions are set up to avoid latching, and thus provide for a controllable restart feature. Such drivers include an isolated half bridge resonant converter with an improved control approach designed to regulate very low current though primary side in a feed-forward loop. Such drivers include both digital and analog loops that improve the performance in steady state and/or during transients, particularly for a lighting load, in comparison to a single full digital control.
Claims17
A regulation circuit comprising:
- a forward loop connectable to a primary side of a transformer, the forward loop sampling a load current at the primary side of a transformer as a half waveform proportional to the load current, the forward loop providing a first output connectable to a controller configured to regulate a solid state driver;
- and
- a feedback loop connectable to a secondary side of a transformer, the feedback loop providing a second output connectable to a controller configured to regulate the solid state driver;
- wherein the forward loop comprises:
- a half-bridge shunt circuit having a shunt circuit input and a shunt circuit output;
- a first series resistor having a first lead connected to the output of the half-bridge shunt circuit and a second lead;
- and
- a converter having an input connected to the second lead of the first series resistor and an output comprising the first output to regulate a solid state driver.
Dependencies are inferred from the claim text.