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US 11,206,722 B2Granted
Lighting control circuit, lighting installation and method
AssigneeTrestoto Pty Limited
InventorsDonat Majewski, Shane Majewski
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AssigneeTrestoto Pty Limited
InventorsDonat Majewski, Shane Majewski
Estimating the term…
The present invention discloses a lighting installation having an LED lamp (19), normally consisting of a series string of individual LED's (18), which is supplied by a rectifier (20, 200). A control circuit (23, 23 & C1) is interposed between the rectifier and the AC supply which powers the rectifier. Various circuits for filtering, power factor control, multi-phase operation and dimming, for example by phase switching, are disclosed. In particular, the control carried out by the control circuit takes place on the AC side of the rectifier. Also disclosed are the control circuit per se and a method of converting a High Intensity Discharge (HID) lamp installation into a Light Emitting Diode (LED) installation. The control circuit can take the form of an inductor, an inductor and series capacitor, a shunt inductor, a leakage reactance transformer, a constant current transformer, an autotransformer, an isolation transformer or a ferro-resonant transformer.
A control circuit for supplying a substantially constant DC current to a LED lamp unit which constitutes a load, said circuit comprising AC inputs for connection to an AC supply which is subject to variations including supply voltage fluctuations and transients, a pair of lamp outputs for connection to said LED lamp unit, and a full wave rectifying circuit supplying a DC voltage and said substantially constant DC current to said lamp outputs, wherein an AC control circuit is interposed between said AC inputs and said rectifying circuit to reduce variations in the magnitude of an AC current supplied to said rectifying circuit from said AC control circuit to thereby reduce corresponding variations in said substantially constant DC current, said AC control circuit includes a capacitor and an inductive winding of a magnetic component comprising a non-linear inductance and having a magnetically permeable core that at least part of which in operation is at least partially saturated by ferro-resonance, wherein said capacitor, said rectifying circuit and said LED lamp unit are electrically connected in series to conduct a load current, said load current is controlled by said inductive winding, and said ferro-resonance being at least in part created by said load current.
A lighting installation comprising an LED lamp fixture constituting a load supplied with a substantially constant DC current by a full wave rectifying circuit, said rectifying circuit being supplied by an AC supply which is subject to variations including supply voltage fluctuations and transients, and an AC control circuit interposed between said rectifying circuit and said AC supply to reduce variations in the magnitude of an AC current supplied to said rectifying circuit from said AC control circuit to thereby reduce corresponding variations in said substantially constant DC current, said AC control circuit includes a capacitor and an inductive winding of a magnetic component comprising a non-linear inductance and having a magnetically permeable core that at least part of which in operation is at least partially saturated by ferro-resonance, wherein said capacitor, said rectifying circuit and said LED lamp unit are electrically connected in series to conduct a load current, said load current is controlled by said inductive winding, and said ferro-resonance being at least in part created by said load current.
A method of converting a High Intensity Discharge (HID) lamp installation supplied by an AC supply subject to variations including supply voltage variations and transients, and including a HID lamp fitting, a ballast and associated control gear, to a LED lamp installation including a LED lamp fitting supplied with a substantially constant DC current, said method comprising the steps of:
Dependencies are inferred from the claim text.