LIGHTING DEVICE FOR SOLID-STATE LIGHT SOURCE AND ILLUMINATION APPARATUS INCLUDING SAME
First Claim
1. A lighting device for a solid-state light source, comprising:
- a DC power source circuit section which performs power conversion of a power of a DC input power source by using an inductor connected in series to a switching element, and flows a current in a solid-state light source by using a charging/discharging current or either one of charging and discharging currents of the inductor; and
a current control section which controls the switching element to control a current flowing through the solid-state light source for controlling a dimming level of the solid-state light source,wherein the current control section includes a first switching control unit for changing an ON width of the switching element depending on the dimming level; and
a second switching control unit for controlling an ON timing of the switching element, andwherein the second switching control unit changes a time until the switching element is turned on from a zero-crossing of the discharging current of the inductor such that the time becomes substantially the same when the dimming level is equal to or greater than a predetermined level, and the time becomes longer when the dimming level is less than the predetermined level.
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Accused Products
Abstract
A lighting device for a solid-state light source includes a DC power source circuit section which flows a current in a solid-state light source by using a charging/discharging current or either one of charging and discharging currents of a inductor connected in series to a switching element, and a current control section having a first switching control unit for changing an ON width of the switching element depending on a dimming level and a second switching control unit for controlling an ON timing of the switching element. The second switching control unit changes a time until the switching element is turned on from a zero-crossing of the discharging current of the inductor such that the time becomes substantially the same when the dimming level is equal to or greater than a predetermined level, and the time becomes longer when the dimming level is less than the predetermined level.
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Citations
6 Claims
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1. A lighting device for a solid-state light source, comprising:
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a DC power source circuit section which performs power conversion of a power of a DC input power source by using an inductor connected in series to a switching element, and flows a current in a solid-state light source by using a charging/discharging current or either one of charging and discharging currents of the inductor; and a current control section which controls the switching element to control a current flowing through the solid-state light source for controlling a dimming level of the solid-state light source, wherein the current control section includes a first switching control unit for changing an ON width of the switching element depending on the dimming level; and
a second switching control unit for controlling an ON timing of the switching element, andwherein the second switching control unit changes a time until the switching element is turned on from a zero-crossing of the discharging current of the inductor such that the time becomes substantially the same when the dimming level is equal to or greater than a predetermined level, and the time becomes longer when the dimming level is less than the predetermined level. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification