Invalidity dossier
US 8362710
Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays
Current assignee: Ilumisys Inc
Added 9/23/2026, 12:13:02 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 8,362,710 B2
Title: "Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays"
Assignee / Inventor: Original assignee Ilumisys Inc (current assignee also listed as Ilumisys Inc); inventor Nick Langovsky.
Key dates: Priority date 2009-01-21; application US 12/689,498 filed 2010-01-19; published as US 2010/0181933 A1 (2010-07-22); granted 2013-01-29; adjusted expiration 2031-08-04. Status listed as active.
Purpose: The invention relates to converting alternating current (AC) to direct current (DC), specifically single-stage AC-to-DC conversion for operating LED arrays. The stated problem is that known converters are impractical for some LED applications due to size and cost, because passive components such as capacitors and inductors grow larger as operating voltages increase.
Plain-language scope: The power converter has a pair of input terminals connectable to a signal source and at least one LED. A first circuit supplies current to the LED and includes first and second bi-directional switches, respectively connected between one input terminal and one side of the LED, and between the other side of the LED and the other input terminal. Current flows through the LED in a predetermined direction when both switches conduct in a first direction. A second circuit includes third and fourth bi-directional switches, connected between the other input terminal and the one side of the LED, and between the one input terminal and the other side of the LED. In the disclosed method, first and second control circuits generate control signals for the first/third and second/fourth switches, supplying current to the LED in a first predetermined direction. The excerpt describes a single-diode load symbol representing a plurality of LEDs in an array, an AC link capacitor, a current-limiting resistor, and gate-drive logic sequencing phases A and B, with simulation waveforms at various conduction angles.
Not established by this excerpt: The full text of the claims; the omitted portion of the description (text is marked "[Excerpt only; consult the source for omitted text.]"); the exact content of FIGS. 1–11 beyond the brief descriptions given; and any statement about validity, enforceability, litigation, or ownership transfers (not addressed here, per instruction).
Generated 10/1/2026, 9:53:46 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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