Patents
US 11191220 B2: Method and apparatus for horticultural lighting with current sharing
- Granted
- 2021-12-07
- Filed
- 2020-02-02 application 16779636
- Type
- Utility · 9 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A method and apparatus for a light fixture that uses current sharing across any one or more parallel LED strings within the light fixture. A processor determines the current requirements of the one or more LED strings that are needed to produce a given intensity level. The processor then apportions the current generation capability of a power supply across all active LED strings using time division multiple access (TDMA) whereby each LED string conducts its apportioned current within its allocated time slot to the mutual exclusion of the remaining active LED strings in any given time period. The light fixture utilizes LEDs with increased forward voltage interspersed with LEDs having reduced forward voltage in the same LED string. A processor utilizes shunt devices across the one or more LEDs with increased forward voltage to substantially match the cumulative forward voltage of each LED string.
Source: PVGPATDIS, file of 2026-04-10 (ipg211207.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Illum Horticulture LLC 20 patents | US company or organization | Mesa, AZ | Illum Horticulture LLC Form D issuer EXACT high confidence: identical full name and state | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Stephen P. Adams | Mesa, AZ | 60 | PVGPATDIS, file of 2026-04-10 | |
| Arthur A. Wilkes | Mesa, AZ | 9 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| A01G | Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops or seaweed; forestry; watering | A01G7/045 | PVGPATDIS, file of 2026-04-10 |
| H05B | Electric heating; electric light sources not otherwise provided for; circuit arrangements for electric light sources, in general | H05B45/18 | PVGPATDIS, file of 2026-04-10 |
| F21V | Functional features or details of lighting devices or systems thereof; structural combinations of lighting devices with other articles, not otherwise provided for | F21V5/007 | PVGPATDIS, file of 2026-04-10 |
| G01J | Measurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics of infrared, visible or ultraviolet light; colorimetry; radiation pyrometry | G01J1/029 | PVGPATDIS, file of 2026-04-10 |
| F21Y | Indexing scheme associated with subclasses f21k, f21l, f21s and f21v, relating to the form or the kind of the light sources or of the colour of the light emitted | F21Y2113/13 | PVGPATDIS, file of 2026-04-10 |
| Y02B | Climate change mitigation technologies related to buildings, e.g. housing, house appliances or related end-user applications | Y02B20/40 | PVGPATDIS, file of 2026-04-10 |
| Y02P | Climate change mitigation technologies in the production or processing of goods | Y02P60/14 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2023-05-25 | Assignment Assignment of assignor's interest | WARBIRD CAPITAL LLC signed 2023-05-25 | SCYNCE LED LLC NEW CANAAN, CT | 63760/643 | PASDL, file of 2026-10-15 |
| 2023-03-28 | Assignment Assignment of assignor's interest | ILLUM HORTICULTURE LLC signed 2023-03-21 | WARBIRD CAPITAL LLC NEW CANAAN, CT | 63126/76 | PASDL, file of 2026-10-15 |
| 2023-03-07 | Release of security interest Release of security interest | STEPHEN P AND KRISTI A ADAMS FAMILY TRUST signed 2023-03-06 | ILLUM HORTICULTURE LLC MESA, AZ | 62901/784 | PASDL, file of 2026-10-15 |
| 2022-03-25 | Security interest Security interest Security interest | ILLUM HORTICULTURE LLC signed 2022-03-22 | STEPHEN P AND KRISTI A ADAMS FAMILY TRUST MESA, AZ | 60088/140 | PASDL, file of 2026-10-15 |
| 2021-11-08 | Assignment Assignment of assignor's interest | ILLUM TECHNOLOGY LLC signed 2021-08-12 | ILLUM HORTICULTURE, LLC MESA, AZ | 58047/15 | PASDL, file of 2026-10-15 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.