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US 2019/0098717 A1Published application
Ballast system, luminaire, lighting control system, lighting control method and non-transitory computer readable medium
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsKenichi FUKUDA, Hirofumi KONISHI, Masashi MOTOMURA
Life of this patent
Estimating the term…
Abstract
The ballast system includes constant current circuits, the power supply circuit, signal paths, a control circuit and pull-up circuits. A junction point of resistors in each of the pull-up circuits is connected to a corresponding signal path of the signal paths.
Claims11
A ballast system, comprising:
- a plurality of constant current circuits configured to be connected in series with a respective one of a plurality of light source modules of a light source so that the constant current circuits and the light source modules constitute respective series circuits, the constant current circuits being configured to respectively adjust load currents flowing through the light source modules;
- a power supply circuit that includes a pair of output terminals between which the series circuits are connected in parallel, the power supply circuit being configured to apply a DC voltage across each of the series circuits through the pair of output terminals;
- a plurality of signal paths that provide respective feedback voltages corresponding to voltage drops across the constant current circuits to be respectively applied to the plurality of signal paths;
- a control circuit that is connected with the signal paths, the control circuit being configured to control the power supply circuit so that a target feedback voltage is maintained at a predefined target voltage value, thereby adjusting the DC voltage, the target feedback voltage being a lowest feedback voltage of the feedback voltages;
- and
- pull-up circuits, each of which includes a first end and a second end and at least two resistors connected in series between the first and second ends to constitute a voltage divider based upon which a predetermined voltage may be applied across the first and second ends,
- a junction point of the resistors in each of the pull-up circuits being connected to a corresponding signal path of the plurality of signal paths.
4 more elements
A luminaire, comprising:
- a light source including light source modules;
- constant current circuits that are connected in series with the light source modules so that the constant current circuits and the light source modules constitute their respective series circuits, the constant current circuits being configured to respectively adjust load currents flowing through the light source modules;
- a power supply circuit that has a pair of output terminals between which the series circuits are connected in parallel, the power supply circuit being configured to apply a DC voltage across each of the series circuits through the pair of output terminals;
- signal paths that allow feedback voltages corresponding to voltage drops across the constant current circuits to be respectively applied to;
- a control circuit that is connected with the signal paths, the control circuit being configured to control the power supply circuit so that a target feedback voltage is maintained at a target voltage value, thereby adjusting the DC voltage, the target feedback voltage being a lowest feedback voltage of the feedback voltages;
- and
- pull-up circuits, each of which includes a first end and a second end as well as resistors, the resistors being connected in series between the first and second ends to constitute a voltage divider that allows a predetermined voltage to be applied across the first and second ends,
- a junction point of two resistors of the resistors in each of the pull-up circuits being connected to a corresponding signal path of the signal paths.
5 more elements
Dependencies are inferred from the claim text.