Solid State Lamp Control
AssigneeDialog Semiconductor GmbH
InventorsClarita Knoll, Xiaoyan Wang, Nan Shi, Guang Feng, Haiju LI
Life of this patent
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Abstract
Intelligent control of a solid state lamp when coupled to a trailing edge phase cut dimmer switch is provided. On and off cycles of the lamp's power stage switch are enabled during a period when the energy in the bulk capacitor is at its highest levels. During this period a bleeder circuit does not have to be enabled, which results in a greater operational efficiency as compared with normal switching schemes for trailing edge dimmers.
Claims16
A lamp for connection to an AC mains supply via a trailing edge phase cut dimmer switch and comprising:
- an input stage;
- an output stage including a solid state light source;
- a power stage including a power switch for selectively coupling the power stage with the output stage;
- a bleeder circuit including a load and a bleeder switch for selectively coupling a load with the input stage;
- and
- a controller arranged to:
- enable on and off switching cycles of the power switch throughout the course of a period that starts at a point of an AC mains supply cycle as determined by a regulation threshold and ends when the when the phase cut dimmer switch disconnects the AC mains from the lamp, wherein
- the regulation threshold is determined by feedback from one or more previous AC half cycles.
A lighting system comprising a trailing edge phase cut dimmer and a lamp for connection to an AC mains supply via a trailing edge phase cut dimmer switch;
- said lamp comprising:
- an input stage;
- an output stage including a solid state light source;
- a power stage including a power switch for selectively coupling the power stage with the output stage;
- a bleeder circuit including a load and a bleeder switch for selectively coupling a load with the input stage;
- and
- a controller arranged to:
- enable on and off switching cycles of the power switch throughout the course of a period that starts at a point of an AC mains supply cycle as determined by a regulation threshold and ends when the when the phase cut dimmer switch disconnects the AC mains from the lamp, wherein
- the regulation threshold is determined by feedback from one or more previous AC half cycles.
A method of controlling a lamp comprising an input stage;
- an output stage including a solid state light source;
- a power stage including a power switch for selectively coupling the power stage with the output stage;
- a bleeder circuit including a load and a bleeder switch for selectively coupling a load with the input stage;
- said method comprising:
- enabling on and off switching cycles of the power switch throughout the course of a period that starts at a point of an AC mains supply cycle as determined by a regulation threshold and ends when the when the phase cut dimmer switch disconnects the AC mains from the lamp;
- and
- determining the regulation threshold based on feedback from one or more previous AC half cycles.
An integrated circuit comprising:
- an input stage;
- an output stage suitable for coupling with a solid state light source;
- a power stage including a power switch for selectively coupling the power stage with the output stage;
- a bleeder circuit including a load and a bleeder switch for selectively coupling a load with the input stage;
- and
- a controller arranged to:
- enable on and off switching cycles of the power switch throughout the course of a period that starts at a point of an AC mains supply cycle as determined by a regulation threshold and ends when the when the phase cut dimmer switch disconnects the AC mains from the lamp, wherein
- the regulation threshold is determined by feedback from one or more previous AC half cycles.
Dependencies are inferred from the claim text.