Patent ID: 9485820
Filing Date: 2016-11-01
CPC Classification: H05B

Claim Text:
1. A lighting device, comprising: a power conversion unit; an impedance adjustment unit; a first control unit; and a second control unit, wherein the power conversion unit is configured to convert input power to direct-current power used for a light source formed of a solid light emitting element, the impedance adjustment unit is formed of a series circuit of a resistor element and a switch element and is coupled to the light source in parallel, relative to the power conversion unit, the second control unit is configured to cause the power conversion unit to operate, for each predetermined burst cycle, for an operation period which is not longer than the burst cycle, and increase and reduce a ratio of the operation period to the burst cycle, and the first control unit is configured to make the switch element conductive for a predetermined adjustment period which is not longer than the operation period, during the operation period.